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30secondsofcode
2018-01-08 21:26:01 +00:00
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@ -128,10 +128,10 @@ Object<span class="token punctuation">.</span><span class="token function">assig
</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="indexofall" class="section double-padded">indexOfAll</h3><div class="section double-padded"><p>Returns all indices of <code>val</code> in an array. If <code>val</code> never occurs, returns <code>[-1]</code>.</p><p>Use <code>Array.forEach()</code> to loop over elements and <code>Array.push()</code> to store indices for matching elements. Return <code>[-1]</code> if <code>length</code> of the array of indices is <code>0</code>, otherwise return the array of indices.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">indexOfAll</span> <span class="token operator">=</span> <span class="token punctuation">(</span>arr<span class="token punctuation">,</span> val<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> indices <span class="token operator">=</span> <span class="token punctuation">[];</span>
arr<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">((</span>el<span class="token punctuation">,</span> i<span class="token punctuation">)</span> <span class="token operator">=></span> el <span class="token operator">===</span> val <span class="token operator">&amp;&amp;</span> indices<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>i<span class="token punctuation">));</span>
<span class="token keyword">return</span> indices<span class="token punctuation">.</span>length <span class="token operator">?</span> indices <span class="token punctuation">: [</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">];
<span class="token keyword">return</span> indices<span class="token punctuation">;
};</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">indexOfAll</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">3</span><span class="token punctuation">],</span> <span class="token number">1</span><span class="token punctuation">);</span> <span class="token comment">// [0,3]</span>
<span class="token function">indexOfAll</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 comment">// [-1]</span>
<span class="token function">indexOfAll</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 comment">// []</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="initial" class="section double-padded">initial</h3><div class="section double-padded"><p>Returns all the elements of an array except the last one.</p><p>Use <code>arr.slice(0,-1)</code> to return all but the last element of the array.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">initial</span> <span class="token operator">=</span> arr <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> <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">initial</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">// [1,2]</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="initialize2darray" class="section double-padded">initialize2DArray</h3><div class="section double-padded"><p>Initializes a 2D array of given width and height and value.</p><p>Use <code>Array.map()</code> to generate h rows where each is a new array of size w initialize with value. If the value is not provided, default to <code>null</code>.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">initialize2DArray</span> <span class="token operator">=</span> <span class="token punctuation">(</span>w<span class="token punctuation">,</span> h<span class="token punctuation">,</span> val <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token operator">=></span>