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30secondsofcode
2018-04-10 16:39:24 +00:00
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</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><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>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">offset</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">5</span><span class="token punctuation">],</span> <span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [3, 4, 5, 1, 2]</span>
<span class="token function">offset</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">5</span><span class="token punctuation">],</span> <span class="token operator">-</span><span class="token number">2</span><span class="token punctuation">);</span> <span class="token comment">// [4, 5, 1, 2, 3]</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="randomintegerinrange.md" class="section double-padded">randomIntegerInRange</h3><div class="section double-padded"><p>Returns a random integer in the specified range.</p><p>Use <code>Math.random()</code> to generate a random number and map it to the desired range, using <code>Math.floor()</code> to make it an integer.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">randomIntegerInRange</span> <span class="token operator">=</span> <span class="token punctuation">(</span>min<span class="token punctuation">,</span> max<span class="token punctuation">)</span> <span class="token operator">=></span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">()</span> <span class="token operator">*</span> <span class="token punctuation">(</span>max <span class="token operator">-</span> min <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">))</span> <span class="token operator">+</span> min<span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">randomIntegerInRange</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">);</span> <span class="token comment">// 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="reversestring.md" class="section double-padded">reverseString</h3><div class="section double-padded"><p>Reverses a string.</p><p>Use the spread operator (<code>...</code>) and <code>Array.reverse()</code> to reverse the order of the characters in the string. Combine characters to get a string using <code>String.join('')</code>.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">reverseString</span> <span class="token operator">=</span> str <span class="token operator">=></span> <span class="token punctuation">[</span><span class="token operator">...</span>str<span class="token punctuation">].</span><span class="token function">reverse</span><span class="token punctuation">().</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">);</span>