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30secondsofcode
2018-09-04 20:53:57 +00:00
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@ -224,7 +224,7 @@
};</span>
</pre><label class="collapse">Show examples</label><pre class="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>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="intersectionby" class="section double-padded">intersectionBy</h3><div class="section double-padded"><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><pre class="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>
<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>x <span class="token operator">=></span> <span class="token function">fn</span><span class="token punctuation">(</span>x<span class="token punctuation">)));</span>
<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>
<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">)));
};</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">intersectionBy</span><span class="token punctuation">([</span><span class="token number">2.1</span><span class="token punctuation">,</span> <span class="token number">1.2</span><span class="token punctuation">], [</span><span class="token number">2.3</span><span class="token punctuation">,</span> <span class="token number">3.4</span><span class="token punctuation">],</span> Math<span class="token punctuation">.</span>floor<span class="token punctuation">);</span> <span class="token comment">// [2.1]</span>