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30secondsofcode
2018-01-03 23:28:00 +00:00
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README.md
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@ -4904,13 +4904,14 @@ Checks if the given argument is a function.
Use `typeof` to check if a value is classified as a function primitive.
```js
const isFunction = val => val && typeof val === 'function';
const isFunction = val => typeof val === 'function';
```
<details>
<summary>Examples</summary>
```js
isFunction(null); // false
isFunction('x'); // false
isFunction(x => x); // true
```

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docs/index.html
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@ -1088,8 +1088,9 @@ a <span class="token operator">===</span> b<span class="token punctuation">;</sp
</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="isboolean" class="section double-padded">isBoolean</h3><div class="section double-padded"><p>Checks if the given argument is a native boolean element.</p><p>Use <code>typeof</code> to check if a value is classified as a boolean primitive.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">isBoolean</span> <span class="token operator">=</span> val <span class="token operator">=></span> <span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'boolean'</span><span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">isBoolean</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">);</span> <span class="token comment">// false</span>
<span class="token function">isBoolean</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">);</span> <span class="token comment">// true</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="isfunction" class="section double-padded">isFunction</h3><div class="section double-padded"><p>Checks if the given argument is a function.</p><p>Use <code>typeof</code> to check if a value is classified as a function primitive.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">isFunction</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">'function'</span><span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">isFunction</span><span class="token punctuation">(</span><span class="token string">'x'</span><span class="token punctuation">);</span> <span class="token comment">// false</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="isfunction" class="section double-padded">isFunction</h3><div class="section double-padded"><p>Checks if the given argument is a function.</p><p>Use <code>typeof</code> to check if a value is classified as a function primitive.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">isFunction</span> <span class="token operator">=</span> val <span class="token operator">=></span> <span class="token keyword">typeof</span> val <span class="token operator">===</span> <span class="token string">'function'</span><span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">isFunction</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">);</span> <span class="token comment">// false</span>
<span class="token function">isFunction</span><span class="token punctuation">(</span><span class="token string">'x'</span><span class="token punctuation">);</span> <span class="token comment">// false</span>
<span class="token function">isFunction</span><span class="token punctuation">(</span>x <span class="token operator">=></span> x<span class="token punctuation">);</span> <span class="token comment">// true</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="isnull" class="section double-padded">isNull</h3><div class="section double-padded"><p>Returns <code>true</code> if the specified value is <code>null</code>, <code>false</code> otherwise.</p><p>Use the strict equality operator to check if the value and of <code>val</code> are equal to <code>null</code>.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">isNull</span> <span class="token operator">=</span> val <span class="token operator">=></span> val <span class="token operator">===</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token function">isNull</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">);</span> <span class="token comment">// true</span>