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30secondsofcode
2018-08-16 20:31:47 +00:00
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4
README.md
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@ -1979,11 +1979,11 @@ none([0, 0, 0]); // true
Returns the nth element of an array.
Use `Array.slice()` to get an array containing the nth element at the first place.
If the index is out of bounds, return `[]`.
If the index is out of bounds, return `undefined`.
Omit the second argument, `n`, to get the first element of the array.
```js
const nthElement = (arr, n = 0) => (n > 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];
const nthElement = (arr, n = 0) => (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0];
```
<details>

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docs/array.html
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@ -290,7 +290,7 @@
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="none" class="section double-padded">none</h3><div class="section double-padded"><p>Returns <code>true</code> if the provided predicate function returns <code>false</code> for all elements in a collection, <code>false</code> otherwise.</p><p>Use <code>Array.some()</code> to test if any elements in the collection return <code>true</code> based on <code>fn</code>. Omit the second argument, <code>fn</code>, to use <code>Boolean</code> as a default.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">none</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> fn <span class="token operator">=</span> Boolean<span class="token punctuation">)</span> <span class="token operator">=> !</span>arr<span class="token punctuation">.</span><span class="token function">some</span><span class="token punctuation">(</span>fn<span class="token punctuation">);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">none</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 number">3</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">],</span> x <span class="token operator">=></span> x <span class="token operator">==</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// true</span>
<span class="token function">none</span><span class="token punctuation">([</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">]);</span> <span class="token comment">// true</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="nthelement" class="section double-padded">nthElement</h3><div class="section double-padded"><p>Returns the nth element of an array.</p><p>Use <code>Array.slice()</code> to get an array containing the nth element at the first place. If the index is out of bounds, return <code>[]</code>. Omit the second argument, <code>n</code>, to get the first element of the array.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">nthElement</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>n <span class="token operator">></span> <span class="token number">0</span> <span class="token operator">?</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">,</span> n <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">) :</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">))[</span><span class="token number">0</span><span class="token punctuation">];</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="nthelement" class="section double-padded">nthElement</h3><div class="section double-padded"><p>Returns the nth element of an array.</p><p>Use <code>Array.slice()</code> to get an array containing the nth element at the first place. If the index is out of bounds, return <code>undefined</code>. Omit the second argument, <code>n</code>, to get the first element of the array.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">nthElement</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>n <span class="token operator">=== -</span><span class="token number">1</span> <span class="token operator">?</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">) :</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">,</span> n <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">))[</span><span class="token number">0</span><span class="token punctuation">];</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">nthElement</span><span class="token punctuation">([</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token string">'c'</span><span class="token punctuation">],</span> <span class="token number">1</span><span class="token punctuation">);</span> <span class="token comment">// 'b'</span>
<span class="token function">nthElement</span><span class="token punctuation">([</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">],</span> <span class="token operator">-</span><span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// 'a'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="offset" class="section double-padded">offset</h3><div class="section double-padded"><p>Moves the specified amount of elements to the end of the array.</p><p>Use <code>Array.slice()</code> twice to get the elements after the specified index and the elements before that. Use the spread operator(<code>...</code>) to combine the two into one array. If <code>offset</code> is negative, the elements will be moved from end to start.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">offset</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> offset<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>offset<span class="token punctuation">),</span> <span class="token operator">...</span>arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> offset<span class="token punctuation">)];</span>

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docs/beginner.html
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@ -125,7 +125,7 @@
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div></div></div><div class="row"><div class="col-sm-12 col-md-10 col-lg-8 col-md-offset-1 col-lg-offset-2"><div class="card fluid"><h3 id="minn.md" class="section double-padded">minN</h3><div class="section double-padded"><p>Returns the <code>n</code> minimum elements from the provided array. If <code>n</code> is greater than or equal to the provided array's length, then return the original array(sorted in ascending order).</p><p>Use <code>Array.sort()</code> combined with the spread operator (<code>...</code>) to create a shallow clone of the array and sort it in ascending order. Use <code>Array.slice()</code> to get the specified number of elements. Omit the second argument, <code>n</code>, to get a one-element array.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">minN</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">].</span><span class="token function">sort</span><span class="token punctuation">((</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> <span class="token operator">=></span> a <span class="token operator">-</span> b<span class="token punctuation">).</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> n<span class="token punctuation">);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">minN</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 comment">// [1]</span>
<span class="token function">minN</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">2</span><span class="token punctuation">);</span> <span class="token comment">// [1,2]</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div></div></div><div class="row"><div class="col-sm-12 col-md-10 col-lg-8 col-md-offset-1 col-lg-offset-2"><div class="card fluid"><h3 id="nthelement.md" class="section double-padded">nthElement</h3><div class="section double-padded"><p>Returns the nth element of an array.</p><p>Use <code>Array.slice()</code> to get an array containing the nth element at the first place. If the index is out of bounds, return <code>[]</code>. Omit the second argument, <code>n</code>, to get the first element of the array.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">nthElement</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>n <span class="token operator">></span> <span class="token number">0</span> <span class="token operator">?</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">,</span> n <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">) :</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">))[</span><span class="token number">0</span><span class="token punctuation">];</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div></div></div><div class="row"><div class="col-sm-12 col-md-10 col-lg-8 col-md-offset-1 col-lg-offset-2"><div class="card fluid"><h3 id="nthelement.md" class="section double-padded">nthElement</h3><div class="section double-padded"><p>Returns the nth element of an array.</p><p>Use <code>Array.slice()</code> to get an array containing the nth element at the first place. If the index is out of bounds, return <code>undefined</code>. Omit the second argument, <code>n</code>, to get the first element of the array.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">nthElement</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> n <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>n <span class="token operator">=== -</span><span class="token number">1</span> <span class="token operator">?</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">) :</span> arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>n<span class="token punctuation">,</span> n <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">))[</span><span class="token number">0</span><span class="token punctuation">];</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">nthElement</span><span class="token punctuation">([</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token string">'c'</span><span class="token punctuation">],</span> <span class="token number">1</span><span class="token punctuation">);</span> <span class="token comment">// 'b'</span>
<span class="token function">nthElement</span><span class="token punctuation">([</span><span class="token string">'a'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">,</span> <span class="token string">'b'</span><span class="token punctuation">],</span> <span class="token operator">-</span><span class="token number">3</span><span class="token punctuation">);</span> <span class="token comment">// 'a'</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div></div></div><div class="row"><div class="col-sm-12 col-md-10 col-lg-8 col-md-offset-1 col-lg-offset-2"><div class="card fluid"><h3 id="offset.md" class="section double-padded">offset</h3><div class="section double-padded"><p>Moves the specified amount of elements to the end of the array.</p><p>Use <code>Array.slice()</code> twice to get the elements after the specified index and the elements before that. Use the spread operator(<code>...</code>) to combine the two into one array. If <code>offset</code> is negative, the elements will be moved from end to start.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">offset</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> offset<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>offset<span class="token punctuation">),</span> <span class="token operator">...</span>arr<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> offset<span class="token punctuation">)];</span>