Travis build: 541
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30secondsofcode
@ -144,7 +144,7 @@
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="everynth">everyNth</h4><p>Returns every nth element in an array.</p><p>Use <code>Array.filter()</code> to create a new array that contains every nth element of a given array.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">everyNth</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> nth<span class="token punctuation">)</span> <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">((</span>e<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span> i <span class="token operator">%</span> nth <span class="token operator">===</span> nth <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">);</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">everyNth</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">],</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [ 2, 4, 6 ]</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="filternonunique">filterNonUnique</h4><p>Filters out the non-unique values in an array.</p><p>Use <code>Array.filter()</code> for an array containing only the unique values.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">filterNonUnique</span> <span class="token operator">=</span> arr <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>i <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span> <span class="token operator">===</span> arr<span class="token punctuation">.</span><span class="token function">lastIndexOf</span><span class="token punctuation">(</span>i<span class="token punctuation">));</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">filterNonUnique</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]);</span> <span class="token comment">// [1,3,5]</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">filterNonUnique</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]);</span> <span class="token comment">// [1, 3, 5]</span>
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="filternonuniqueby">filterNonUniqueBy</h4><p>Filters out the non-unique values in an array, based on a provided comparator function.</p><p>Use <code>Array.filter()</code> and <code>Array.every()</code> for an array containing only the unique values, based on the comparator function, <code>fn</code>. The comparator function takes four arguments: the values of the two elements being compared and their indexes.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">filterNonUniqueBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span>
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arr<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">((</span>v<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">every</span><span class="token punctuation">((</span>x<span class="token punctuation">,</span> j<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>i <span class="token operator">===</span> j<span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token function">fn</span><span class="token punctuation">(</span>v<span class="token punctuation">,</span> x<span class="token punctuation">,</span> i<span class="token punctuation">,</span> j<span class="token punctuation">)));</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">filterNonUniqueBy</span><span class="token punctuation">(
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@ -205,7 +205,7 @@
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<span class="token function">initializeArrayWithRangeRight</span><span class="token punctuation">(</span><span class="token number">7</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// [7,6,5,4,3]</span>
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<span class="token function">initializeArrayWithRangeRight</span><span class="token punctuation">(</span><span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [8,6,4,2,0]</span>
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="initializearraywithvalues">initializeArrayWithValues</h4><p>Initializes and fills an array with the specified values.</p><p>Use <code>Array(n)</code> to create an array of the desired length, <code>fill(v)</code> to fill it with the desired values. You can omit <code>val</code> to use a default value of <code>0</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">initializeArrayWithValues</span> <span class="token operator">=</span> <span class="token punctuation">(</span>n<span class="token punctuation">,</span> val <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token function">Array</span><span class="token punctuation">(</span>n<span class="token punctuation">).</span><span class="token function">fill</span><span class="token punctuation">(</span>val<span class="token punctuation">);</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">initializeArrayWithValues</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [2,2,2,2,2]</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">initializeArrayWithValues</span><span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [2, 2, 2, 2, 2]</span>
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="initializendarray">initializeNDArray</h4><p>Create a n-dimensional array with given value.</p><p>Use recursion. Use <code>Array.map()</code> to generate rows where each is a new array initialized using <code>initializeNDArray</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">initializeNDArray</span> <span class="token operator">=</span> <span class="token punctuation">(</span>val<span class="token punctuation">,</span> <span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=></span>
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args<span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">0</span>
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<span class="token operator">?</span> val
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@ -216,7 +216,7 @@
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<span class="token keyword">const</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Set</span><span class="token punctuation">(</span>b<span class="token punctuation">);</span>
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<span class="token keyword">return</span> a<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>x <span class="token operator">=></span> s<span class="token punctuation">.</span><span class="token function">has</span><span class="token punctuation">(</span>x<span class="token punctuation">));
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};</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">intersection</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">], [</span><span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]);</span> <span class="token comment">// [2,3]</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">intersection</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">], [</span><span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]);</span> <span class="token comment">// [2, 3]</span>
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="intersectionby">intersectionBy</h4><p>Returns a list of elements that exist in both arrays, after applying the provided function to each array element of both.</p><p>Create a <code>Set</code> by applying <code>fn</code> to all elements in <code>b</code>, then use <code>Array.filter()</code> on <code>a</code> to only keep elements, which produce values contained in <code>b</code> when <code>fn</code> is applied to them.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">intersectionBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Set</span><span class="token punctuation">(</span>b<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span>fn<span class="token punctuation">));</span>
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<span class="token keyword">return</span> a<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>x <span class="token operator">=></span> s<span class="token punctuation">.</span><span class="token function">has</span><span class="token punctuation">(</span><span class="token function">fn</span><span class="token punctuation">(</span>x<span class="token punctuation">)));
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@ -275,10 +275,10 @@
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))();</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token keyword">const</span> <span class="token function-variable function">squareIt</span> <span class="token operator">=</span> arr <span class="token operator">=></span> <span class="token function">mapObject</span><span class="token punctuation">(</span>arr<span class="token punctuation">,</span> a <span class="token operator">=></span> a <span class="token operator">*</span> a<span class="token punctuation">);</span>
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<span class="token function">squareIt</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]);</span> <span class="token comment">// { 1: 1, 2: 4, 3: 9 }</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="maxn">maxN</h4><p>Returns the <code>n</code> maximum elements from the provided array. If <code>n</code> is greater than or equal to the provided array's length, then return the original array(sorted in descending order).</p><p>Use <code>Array.sort()</code> combined with the spread operator (<code>...</code>) to create a shallow clone of the array and sort it in descending order. Use <code>Array.slice()</code> to get the specified number of elements. Omit the second argument, <code>n</code>, to get a one-element array.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">maxN</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">].</span><span class="token function">sort</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> b <span class="token operator">-</span> a<span class="token punctuation">).</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> n<span class="token punctuation">);</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="maxn">maxN</h4><p>Returns the <code>n</code> maximum elements from the provided array. If <code>n</code> is greater than or equal to the provided array's length, then return the original array (sorted in descending order).</p><p>Use <code>Array.sort()</code> combined with the spread operator (<code>...</code>) to create a shallow clone of the array and sort it in descending order. Use <code>Array.slice()</code> to get the specified number of elements. Omit the second argument, <code>n</code>, to get a one-element array.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">maxN</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">].</span><span class="token function">sort</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> b <span class="token operator">-</span> a<span class="token punctuation">).</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> n<span class="token punctuation">);</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">maxN</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]);</span> <span class="token comment">// [3]</span>
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<span class="token function">maxN</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">],</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [3,2]</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="minn">minN</h4><p>Returns the <code>n</code> minimum elements from the provided array. If <code>n</code> is greater than or equal to the provided array's length, then return the original array(sorted in ascending order).</p><p>Use <code>Array.sort()</code> combined with the spread operator (<code>...</code>) to create a shallow clone of the array and sort it in ascending order. Use <code>Array.slice()</code> to get the specified number of elements. Omit the second argument, <code>n</code>, to get a one-element array.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">minN</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">].</span><span class="token function">sort</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> a <span class="token operator">-</span> b<span class="token punctuation">).</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> n<span class="token punctuation">);</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="minn">minN</h4><p>Returns the <code>n</code> minimum elements from the provided array. If <code>n</code> is greater than or equal to the provided array's length, then return the original array (sorted in ascending order).</p><p>Use <code>Array.sort()</code> combined with the spread operator (<code>...</code>) to create a shallow clone of the array and sort it in ascending order. Use <code>Array.slice()</code> to get the specified number of elements. Omit the second argument, <code>n</code>, to get a one-element array.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">minN</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">].</span><span class="token function">sort</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> a <span class="token operator">-</span> b<span class="token punctuation">).</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> n<span class="token punctuation">);</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">minN</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]);</span> <span class="token comment">// [1]</span>
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<span class="token function">minN</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">],</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [1,2]</span>
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</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="none">none</h4><p>Returns <code>true</code> if the provided predicate function returns <code>false</code> for all elements in a collection, <code>false</code> otherwise.</p><p>Use <code>Array.some()</code> to test if any elements in the collection return <code>true</code> based on <code>fn</code>. Omit the second argument, <code>fn</code>, to use <code>Boolean</code> as a default.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">none</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> fn <span class="token operator">=</span> Boolean<span class="token punctuation">)</span> <span class="token operator">=> !</span>arr<span class="token punctuation">.</span><span class="token function">some</span><span class="token punctuation">(</span>fn<span class="token punctuation">);</span>
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@ -424,9 +424,9 @@ console<span class="token punctuation">.</span><span class="token function">log<
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<span class="token keyword">return</span> arr<span class="token punctuation">;
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};</span>
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</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token keyword">const</span> foo <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">];</span>
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<span class="token function">shuffle</span><span class="token punctuation">(</span>foo<span class="token punctuation">);</span> <span class="token comment">// [2,3,1], foo = [1,2,3]</span>
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<span class="token function">shuffle</span><span class="token punctuation">(</span>foo<span class="token punctuation">);</span> <span class="token comment">// [2, 3, 1], foo = [1, 2, 3]</span>
|
||||
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="similarity">similarity</h4><p>Returns an array of elements that appear in both arrays.</p><p>Use <code>Array.filter()</code> to remove values that are not part of <code>values</code>, determined using <code>Array.includes()</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">similarity</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> values<span class="token punctuation">)</span> <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>v <span class="token operator">=></span> values<span class="token punctuation">.</span><span class="token function">includes</span><span class="token punctuation">(</span>v<span class="token punctuation">));</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">similarity</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">], [</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]);</span> <span class="token comment">// [1,2]</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">similarity</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">], [</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">]);</span> <span class="token comment">// [1, 2]</span>
|
||||
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="sortedindex">sortedIndex</h4><p>Returns the lowest index at which value should be inserted into array in order to maintain its sort order.</p><p>Check if the array is sorted in descending order (loosely). Use <code>Array.findIndex()</code> to find the appropriate index where the element should be inserted.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">sortedIndex</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">const</span> isDescending <span class="token operator">=</span> arr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token operator">></span> arr<span class="token punctuation">[</span>arr<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">];</span>
|
||||
<span class="token keyword">const</span> index <span class="token operator">=</span> arr<span class="token punctuation">.</span><span class="token function">findIndex</span><span class="token punctuation">(</span>el <span class="token operator">=></span> <span class="token punctuation">(</span>isDescending <span class="token operator">?</span> n <span class="token operator">>=</span> el <span class="token punctuation">:</span> n <span class="token operator"><=</span> el<span class="token punctuation">));</span>
|
||||
@ -536,7 +536,7 @@ managers<span class="token punctuation">;</span> <span class="token comment">//
|
||||
Array<span class="token punctuation">.</span><span class="token keyword">from</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Set</span><span class="token punctuation">([</span><span class="token operator">...</span>a<span class="token punctuation">,</span> <span class="token operator">...</span>b<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>x <span class="token operator">=></span> a<span class="token punctuation">.</span><span class="token function">findIndex</span><span class="token punctuation">(</span>y <span class="token operator">=></span> <span class="token function">comp</span><span class="token punctuation">(</span>x<span class="token punctuation">,</span> y<span class="token punctuation">))</span> <span class="token operator">=== -</span><span class="token number">1</span><span class="token punctuation">)]));</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">unionWith</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1.2</span><span class="token punctuation">,</span> <span class="token number">1.5</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">], [</span><span class="token number">1.9</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3.9</span><span class="token punctuation">], (</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> Math<span class="token punctuation">.</span><span class="token function">round</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span> <span class="token operator">===</span> Math<span class="token punctuation">.</span><span class="token function">round</span><span class="token punctuation">(</span>b<span class="token punctuation">));</span> <span class="token comment">// [1, 1.2, 1.5, 3, 0, 3.9]</span>
|
||||
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="uniqueelements">uniqueElements</h4><p>Returns all unique values of an array.</p><p>Use ES6 <code>Set</code> and the <code>...rest</code> operator to discard all duplicated values.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">uniqueElements</span> <span class="token operator">=</span> arr <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span><span class="token keyword">new</span> <span class="token class-name">Set</span><span class="token punctuation">(</span>arr<span class="token punctuation">)];</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">uniqueElements</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]);</span> <span class="token comment">// [1,2,3,4,5]</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">uniqueElements</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]);</span> <span class="token comment">// [1, 2, 3, 4, 5]</span>
|
||||
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="uniqueelementsby">uniqueElementsBy</h4><p>Returns all unique values of an array, based on a provided comparator function.</p><p>Use <code>Array.reduce()</code> and <code>Array.some()</code> for an array containing only the first unique occurence of each value, based on the comparator function, <code>fn</code>. The comparator function takes two arguments: the values of the two elements being compared.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">uniqueElementsBy</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> fn<span class="token punctuation">)</span> <span class="token operator">=></span>
|
||||
arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>acc<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>acc<span class="token punctuation">.</span><span class="token function">some</span><span class="token punctuation">(</span>x <span class="token operator">=></span> <span class="token function">fn</span><span class="token punctuation">(</span>v<span class="token punctuation">,</span> x<span class="token punctuation">)))</span> acc<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>v<span class="token punctuation">);</span>
|
||||
|
||||
@ -214,7 +214,7 @@ own individual rating by supplying it as the third argument.
|
||||
<span class="token punctuation">(</span><span class="token number">100</span> <span class="token operator">*</span> arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>acc<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token operator">=></span> acc <span class="token operator">+</span> <span class="token punctuation">(</span>v <span class="token operator"><</span> val <span class="token operator">?</span> <span class="token number">1</span> <span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token punctuation">(</span>v <span class="token operator">===</span> val <span class="token operator">?</span> <span class="token number">0.5</span> <span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">),</span> <span class="token number">0</span><span class="token punctuation">))</span> <span class="token operator">/</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">;</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">percentile</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">],</span> <span class="token number">6</span><span class="token punctuation">);</span> <span class="token comment">// 55</span>
|
||||
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="powerset">powerset</h4><p>Returns the powerset of a given array of numbers.</p><p>Use <code>Array.reduce()</code> combined with <code>Array.map()</code> to iterate over elements and combine into an array containing all combinations.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">powerset</span> <span class="token operator">=</span> arr <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token operator">=></span> a<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span>a<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span>r <span class="token operator">=></span> <span class="token punctuation">[</span>v<span class="token punctuation">].</span><span class="token function">concat</span><span class="token punctuation">(</span>r<span class="token punctuation">))), [[]]);</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">powerset</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]);</span> <span class="token comment">// [[], [1], [2], [2,1]]</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">powerset</span><span class="token punctuation">([</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]);</span> <span class="token comment">// [[], [1], [2], [2, 1]]</span>
|
||||
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="primes">primes</h4><p>Generates primes up to a given number, using the Sieve of Eratosthenes.</p><p>Generate an array from <code>2</code> to the given number. Use <code>Array.filter()</code> to filter out the values divisible by any number from <code>2</code> to the square root of the provided number.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">primes</span> <span class="token operator">=</span> num <span class="token operator">=></span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">let</span> arr <span class="token operator">=</span> Array<span class="token punctuation">.</span><span class="token keyword">from</span><span class="token punctuation">({</span> length<span class="token punctuation">:</span> num <span class="token operator">-</span> <span class="token number">1</span> <span class="token punctuation">}).</span><span class="token function">map</span><span class="token punctuation">((</span>x<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span> i <span class="token operator">+</span> <span class="token number">2</span><span class="token punctuation">),</span>
|
||||
sqroot <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">sqrt</span><span class="token punctuation">(</span>num<span class="token punctuation">)),</span>
|
||||
|
||||
@ -281,7 +281,7 @@ Foo<span class="token punctuation">.</span>prototype<span class="token punctuati
|
||||
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="objectfrompairs">objectFromPairs</h4><p>Creates an object from the given key-value pairs.</p><p>Use <code>Array.reduce()</code> to create and combine key-value pairs.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">objectFromPairs</span> <span class="token operator">=</span> arr <span class="token operator">=></span> arr<span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">((</span>a<span class="token punctuation">, [</span>key<span class="token punctuation">,</span> val<span class="token punctuation">])</span> <span class="token operator">=></span> <span class="token punctuation">((</span>a<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> val<span class="token punctuation">),</span> a<span class="token punctuation">), {});</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">objectFromPairs</span><span class="token punctuation">([[</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">], [</span><span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]]);</span> <span class="token comment">// {a: 1, b: 2}</span>
|
||||
</pre></div><div class="card code-card"><div class="corner beginner"></div><div class="section card-content"><h4 id="objecttopairs">objectToPairs</h4><p>Creates an array of key-value pair arrays from an object.</p><p>Use <code>Object.keys()</code> and <code>Array.map()</code> to iterate over the object's keys and produce an array with key-value pairs.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">objectToPairs</span> <span class="token operator">=</span> obj <span class="token operator">=></span> Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">).</span><span class="token function">map</span><span class="token punctuation">(</span>k <span class="token operator">=></span> <span class="token punctuation">[</span>k<span class="token punctuation">,</span> obj<span class="token punctuation">[</span>k<span class="token punctuation">]]);</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">objectToPairs</span><span class="token punctuation">({</span> a<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> b<span class="token punctuation">:</span> <span class="token number">2</span> <span class="token punctuation">});</span> <span class="token comment">// [['a',1],['b',2]]</span>
|
||||
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">objectToPairs</span><span class="token punctuation">({</span> a<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> b<span class="token punctuation">:</span> <span class="token number">2</span> <span class="token punctuation">});</span> <span class="token comment">// [ ['a', 1], ['b', 2] ]</span>
|
||||
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="omit">omit</h4><p>Omits the key-value pairs corresponding to the given keys from an object.</p><p>Use <code>Object.keys(obj)</code>, <code>Array.filter()</code> and <code>Array.includes()</code> to remove the provided keys. Use <code>Array.reduce()</code> to convert the filtered keys back to an object with the corresponding key-value pairs.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">omit</span> <span class="token operator">=</span> <span class="token punctuation">(</span>obj<span class="token punctuation">,</span> arr<span class="token punctuation">)</span> <span class="token operator">=></span>
|
||||
Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)
|
||||
.</span><span class="token function">filter</span><span class="token punctuation">(</span>k <span class="token operator">=> !</span>arr<span class="token punctuation">.</span><span class="token function">includes</span><span class="token punctuation">(</span>k<span class="token punctuation">))
|
||||
|
||||
Reference in New Issue
Block a user