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30secondsofcode
2018-06-23 05:55:14 +00:00
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@ -110,7 +110,7 @@
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="equals" class="section double-padded">equals<mark class="tag">advanced</mark></h3><div class="section double-padded"><p>Performs a deep comparison between two values to determine if they are equivalent.</p><p>Check if the two values are identical, if they are both <code>Date</code> objects with the same time, using <code>Date.getTime()</code> or if they are both non-object values with an equivalent value (strict comparison). Check if only one value is <code>null</code> or <code>undefined</code> or if their prototypes differ. If none of the above conditions are met, use <code>Object.keys()</code> to check if both values have the same number of keys, then use <code>Array.every()</code> to check if every key in the first value exists in the second one and if they are equivalent by calling this method recursively.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">equals</span> <span class="token operator">=</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 punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>a <span class="token operator">===</span> b<span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>a <span class="token keyword">instanceof</span> <span class="token class-name">Date</span> <span class="token operator">&amp;&amp;</span> b <span class="token keyword">instanceof</span> <span class="token class-name">Date</span><span class="token punctuation">)</span> <span class="token keyword">return</span> a<span class="token punctuation">.</span><span class="token function">getTime</span><span class="token punctuation">()</span> <span class="token operator">===</span> b<span class="token punctuation">.</span><span class="token function">getTime</span><span class="token punctuation">();</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>a <span class="token operator">|| !</span>b <span class="token operator">||</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> a <span class="token operator">!=</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> b <span class="token operator">!==</span> <span class="token string">'object'</span><span class="token punctuation">))</span> <span class="token keyword">return</span> a <span class="token operator">===</span> b<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>a <span class="token operator">|| !</span>b <span class="token operator">||</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> a <span class="token operator">!==</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> b <span class="token operator">!==</span> <span class="token string">'object'</span><span class="token punctuation">))</span> <span class="token keyword">return</span> a <span class="token operator">===</span> b<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>a <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">||</span> a <span class="token operator">===</span> undefined <span class="token operator">||</span> b <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">||</span> b <span class="token operator">===</span> undefined<span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>a<span class="token punctuation">.</span>prototype <span class="token operator">!==</span> b<span class="token punctuation">.</span>prototype<span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> keys <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>a<span class="token punctuation">);</span>