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30secondsofcode
2019-04-08 18:22:10 +00:00
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@ -558,7 +558,7 @@ managers<span class="token punctuation">;</span> <span class="token comment">//
</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></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.prototype.reduce()</code> and <code>Array.prototype.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>
</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.prototype.reduce()</code> and <code>Array.prototype.some()</code> for an array containing only the first unique occurrence 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>
<span class="token keyword">return</span> acc<span class="token punctuation">;
@ -573,7 +573,7 @@ managers<span class="token punctuation">;</span> <span class="token comment">//
],
(</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
<span class="token punctuation">);</span> <span class="token comment">// [ { id: 0, value: 'a' }, { id: 1, value: 'b' }, { id: 2, value: 'c' } ]</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="uniqueelementsbyright">uniqueElementsByRight</h4><p>Returns all unique values of an array, based on a provided comparator function.</p><p>Use <code>Array.prototype.reduce()</code> and <code>Array.prototype.some()</code> for an array containing only the last 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">uniqueElementsByRight</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>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="uniqueelementsbyright">uniqueElementsByRight</h4><p>Returns all unique values of an array, based on a provided comparator function.</p><p>Use <code>Array.prototype.reduce()</code> and <code>Array.prototype.some()</code> for an array containing only the last unique occurrence 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">uniqueElementsByRight</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">reduceRight</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>
<span class="token keyword">return</span> acc<span class="token punctuation">;