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30secondsofcode
2018-10-16 08:37:05 +00:00
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</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="isplainobject">isPlainObject</h4><p>Checks if the provided value is an object created by the Object constructor.</p><p>Check if the provided value is truthy, use <code>typeof</code> to check if it is an object and <code>Object.constructor</code> to make sure the constructor is equal to <code>Object</code>.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isPlainObject</span> <span class="token operator">=</span> val <span class="token operator">=> !!</span>val <span class="token operator">&amp;&amp;</span> <span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'object'</span> <span class="token operator">&amp;&amp;</span> val<span class="token punctuation">.</span>constructor <span class="token operator">===</span> Object<span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">isPlainObject</span><span class="token punctuation">({</span> a<span class="token punctuation">:</span> <span class="token number">1</span> <span class="token punctuation">});</span> <span class="token comment">// true</span>
<span class="token function">isPlainObject</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Map</span><span class="token punctuation">());</span> <span class="token comment">// false</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="isprimitive">isPrimitive</h4><p>Returns a boolean determining if the passed value is primitive or not.</p><p>Use <code>Array.prototype.includes()</code> on an array of type strings which are not primitive, supplying the type using <code>typeof</code>. Since <code>typeof null</code> evaluates to <code>'object'</code>, it needs to be directly compared.</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isPrimitive</span> <span class="token operator">=</span> val <span class="token operator">=> !</span><span class="token punctuation">[</span><span class="token string">'object'</span><span class="token punctuation">,</span> <span class="token string">'function'</span><span class="token punctuation">].</span><span class="token function">includes</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> val<span class="token punctuation">)</span> <span class="token operator">||</span> val <span class="token operator">===</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
</pre></div><div class="card code-card"><div class="corner intermediate"></div><div class="section card-content"><h4 id="isprimitive">isPrimitive</h4><p>Returns a boolean determining if the passed value is primitive or not.</p><p>Create an object from <code>val</code> and compare it with <code>val</code> to determine if the passed value is primitive (i.e. not equal to the created object).</p></div><div class="copy-button-container"><button class="copy-button" aria-label="Copy to clipboard"></button></div><pre class="section card-code language-js"><span class="token keyword">const</span> <span class="token function-variable function">isPrimitive</span> <span class="token operator">=</span> val <span class="token operator">=></span> <span class="token function">Object</span><span class="token punctuation">(</span>val<span class="token punctuation">)</span> <span class="token operator">!==</span> val<span class="token punctuation">;</span>
</pre><label class="collapse">examples</label><pre class="section card-examples language-js"><span class="token function">isPrimitive</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">);</span> <span class="token comment">// true</span>
<span class="token function">isPrimitive</span><span class="token punctuation">(</span><span class="token number">50</span><span class="token punctuation">);</span> <span class="token comment">// true</span>
<span class="token function">isPrimitive</span><span class="token punctuation">(</span><span class="token string">'Hello!'</span><span class="token punctuation">);</span> <span class="token comment">// true</span>