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30secondsofcode
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</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="filternonunique" class="section double-padded">filterNonUnique</h3><div class="section double-padded"><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><pre class="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>
</pre><label class="collapse">Show examples</label><pre class="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>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="filternonuniqueby" class="section double-padded">filterNonUniqueBy</h3><div class="section double-padded"><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><pre class="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>
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>
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>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">filterNonUniqueBy</span><span class="token punctuation">(
[
{</span> id<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">,</span> value<span class="token punctuation">:</span> <span class="token string">'a'</span> <span class="token punctuation">},