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30secondsofcode
2018-01-04 09:30:28 +00:00
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6
README.md
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@ -639,17 +639,17 @@ difference([1, 2, 3], [1, 2, 4]); // [3]
Filters out all values from an array for which the comparator function does not return `true`.
Use `Array.filter()` and `Array.find()` to find the appropriate values.
Use `Array.filter()` and `Array.findIndex()` to find the appropriate values.
```js
const differenceWith = (arr, val, comp) => arr.filter(a => !val.find(b => comp(a, b)));
const differenceWith = (arr, val, comp) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);
```
<details>
<summary>Examples</summary>
```js
differenceWith([1, 1.2, 1.5, 3], [1.9, 3], (a, b) => Math.round(a) == Math.round(b)); // [1, 1.2]
differenceWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b)); // [1, 1.2]
```
</details>

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docs/index.html
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@ -86,8 +86,8 @@ Object<span class="token punctuation">.</span><span class="token function">assig
<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">));
};</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">difference</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">// [3]</span>
</pre><button class="primary clipboard-copy"><img src="clipboard.svg" alt="clipboard">&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="differencewith" class="section double-padded">differenceWith</h3><div class="section double-padded"><p>Filters out all values from an array for which the comparator function does not return <code>true</code>.</p><p>Use <code>Array.filter()</code> and <code>Array.find()</code> to find the appropriate values.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">differenceWith</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> val<span class="token punctuation">,</span> comp<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>a <span class="token operator">=> !</span>val<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span>b <span class="token operator">=></span> <span class="token function">comp</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)));</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">differenceWith</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">1.9</span><span class="token punctuation">,</span> <span class="token number">3</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]</span>
</pre><button class="primary clipboard-copy"><img src="clipboard.svg" alt="clipboard">&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="differencewith" class="section double-padded">differenceWith</h3><div class="section double-padded"><p>Filters out all values from an array for which the comparator function does not return <code>true</code>.</p><p>Use <code>Array.filter()</code> and <code>Array.findIndex()</code> to find the appropriate values.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">differenceWith</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> val<span class="token punctuation">,</span> comp<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>a <span class="token operator">=></span> val<span class="token punctuation">.</span><span class="token function">findIndex</span><span class="token punctuation">(</span>b <span class="token operator">=></span> <span class="token function">comp</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<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">Show examples</label><pre class="language-js"><span class="token function">differenceWith</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>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]</span>
</pre><button class="primary clipboard-copy"><img src="clipboard.svg" alt="clipboard">&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="distinctvaluesofarray" class="section double-padded">distinctValuesOfArray</h3><div class="section double-padded"><p>Returns all the distinct values of an array.</p><p>Use ES6 <code>Set</code> and the <code>...rest</code> operator to discard all duplicated values.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">distinctValuesOfArray</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">Show examples</label><pre class="language-js"><span class="token function">distinctValuesOfArray</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><button class="primary clipboard-copy"><img src="clipboard.svg" alt="clipboard">&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="dropelements" class="section double-padded">dropElements</h3><div class="section double-padded"><p>Removes elements in an array until the passed function returns <code>true</code>. Returns the remaining elements in the array.</p><p>Loop through the array, using <code>Array.slice()</code> to drop the first element of the array until the returned value from the function is <code>true</code>. Returns the remaining elements.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">dropElements</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> func<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>