Travis build: 1272
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30secondsofcode
@ -120,7 +120,7 @@
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arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>i <span class="token operator">*</span> size<span class="token punctuation">,</span> i <span class="token operator">*</span> size <span class="token operator">+</span> size<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">chunk</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">2</span><span class="token punctuation">);</span> <span class="token comment">// [[1,2],[3,4],[5]]</span>
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</pre></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="compact">compact</h4><p>Removes falsey values from an array.</p><p>Use <code>Array.prototype.filter()</code> to filter out falsey values (<code>false</code>, <code>null</code>, <code>0</code>, <code>""</code>, <code>undefined</code>, and <code>NaN</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">compact</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>Boolean<span class="token punctuation">);</span>
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</pre></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="compact">compact</h4><p>Removes falsy values from an array.</p><p>Use <code>Array.prototype.filter()</code> to filter out falsy values (<code>false</code>, <code>null</code>, <code>0</code>, <code>""</code>, <code>undefined</code>, and <code>NaN</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">compact</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>Boolean<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">compact</span><span class="token punctuation">([</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'e'</span> <span class="token operator">*</span> <span class="token number">23</span><span class="token punctuation">,</span> <span class="token number">NaN</span><span class="token punctuation">,</span> <span class="token string">'s'</span><span class="token punctuation">,</span> <span class="token number">34</span><span class="token punctuation">]);</span> <span class="token comment">// [ 1, 2, 3, 'a', 's', 34 ]</span>
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</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="countby">countBy</h4><p>Groups the elements of an array based on the given function and returns the count of elements in each group.</p><p>Use <code>Array.prototype.map()</code> to map the values of an array to a function or property name. Use <code>Array.prototype.reduce()</code> to create an object, where the keys are produced from the mapped results.</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">countBy</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">map</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> fn <span class="token operator">===</span> <span class="token string">'function'</span> <span class="token operator">?</span> fn <span class="token punctuation">:</span> val <span class="token operator">=></span> val<span class="token punctuation">[</span>fn<span class="token punctuation">]).</span><span class="token function">reduce</span><span class="token punctuation">((</span>acc<span class="token punctuation">,</span> val<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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@ -183,9 +183,9 @@
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],
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(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> a<span class="token punctuation">.</span>id <span class="token operator">==</span> b<span class="token punctuation">.</span>id
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<span class="token punctuation">);</span> <span class="token comment">// [ { id: 2, value: 'c' } ]</span>
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</pre></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="findlast">findLast</h4><p>Returns the last element for which the provided function returns a truthy value.</p><p>Use <code>Array.prototype.filter()</code> to remove elements for which <code>fn</code> returns falsey values, <code>Array.prototype.pop()</code> to get the last one.</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">findLast</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">filter</span><span class="token punctuation">(</span>fn<span class="token punctuation">).</span><span class="token function">pop</span><span class="token punctuation">();</span>
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</pre></div><div class="card code-card"><div class="corner beginner" aria-label="beginner" title="beginner"></div><div class="section card-content"><h4 id="findlast">findLast</h4><p>Returns the last element for which the provided function returns a truthy value.</p><p>Use <code>Array.prototype.filter()</code> to remove elements for which <code>fn</code> returns falsy values, <code>Array.prototype.pop()</code> to get the last one.</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">findLast</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">filter</span><span class="token punctuation">(</span>fn<span class="token punctuation">).</span><span class="token function">pop</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">findLast</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> n <span class="token operator">=></span> n <span class="token operator">%</span> <span class="token number">2</span> <span class="token operator">===</span> <span class="token number">1</span><span class="token punctuation">);</span> <span class="token comment">// 3</span>
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</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="findlastindex">findLastIndex</h4><p>Returns the index of the last element for which the provided function returns a truthy value.</p><p>Use <code>Array.prototype.map()</code> to map each element to an array with its index and value. Use <code>Array.prototype.filter()</code> to remove elements for which <code>fn</code> returns falsey values, <code>Array.prototype.pop()</code> to get the last one.</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">findLastIndex</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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</pre></div><div class="card code-card"><div class="corner intermediate" aria-label="intermediate" title="intermediate"></div><div class="section card-content"><h4 id="findlastindex">findLastIndex</h4><p>Returns the index of the last element for which the provided function returns a truthy value.</p><p>Use <code>Array.prototype.map()</code> to map each element to an array with its index and value. Use <code>Array.prototype.filter()</code> to remove elements for which <code>fn</code> returns falsy values, <code>Array.prototype.pop()</code> to get the last one.</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">findLastIndex</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
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<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">((</span>val<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span>i<span class="token punctuation">,</span> val<span class="token punctuation">])
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.</span><span class="token function">filter</span><span class="token punctuation">(([</span>i<span class="token punctuation">,</span> val<span class="token punctuation">])</span> <span class="token operator">=></span> <span class="token function">fn</span><span class="token punctuation">(</span>val<span class="token punctuation">,</span> i<span class="token punctuation">,</span> arr<span class="token punctuation">))
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