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30secondsofcode
2018-08-10 06:33:14 +00:00
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@ -90,10 +90,7 @@
<span class="token keyword">return</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span>selector<span class="token punctuation">);
},</span> <span class="token string">'>_>'</span><span class="token punctuation">);</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>elements <span class="token keyword">instanceof</span> <span class="token class-name">Error</span><span class="token punctuation">)</span> elements <span class="token operator">=</span> <span class="token punctuation">[];</span> <span class="token comment">// elements = []</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="bind" class="section double-padded">bind</h3><div class="section double-padded"><p>Creates a function that invokes <code>fn</code> with a given context, optionally adding any additional supplied parameters to the beginning of the arguments.</p><p>Return a <code>function</code> that uses <code>Function.apply()</code> to apply the given <code>context</code> to <code>fn</code>. Use <code>Array.concat()</code> to prepend any additional supplied parameters to the arguments.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">bind</span> <span class="token operator">=</span> <span class="token punctuation">(</span>fn<span class="token punctuation">,</span> context<span class="token punctuation">,</span> <span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=></span>
<span class="token keyword">function</span><span class="token punctuation">() {</span>
<span class="token keyword">return</span> fn<span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> args<span class="token punctuation">.</span><span class="token function">concat</span><span class="token punctuation">(</span><span class="token operator">...</span>arguments<span class="token punctuation">));
};</span>
</pre><button class="primary clipboard-copy">&#128203;&nbsp;Copy to clipboard</button></div></div><div class="card fluid"><h3 id="bind" class="section double-padded">bind</h3><div class="section double-padded"><p>Creates a function that invokes <code>fn</code> with a given context, optionally adding any additional supplied parameters to the beginning of the arguments.</p><p>Return a <code>function</code> that uses <code>Function.apply()</code> to apply the given <code>context</code> to <code>fn</code>. Use <code>Array.concat()</code> to prepend any additional supplied parameters to the arguments.</p><pre class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">bind</span> <span class="token operator">=</span> <span class="token punctuation">(</span>fn<span class="token punctuation">,</span> context<span class="token punctuation">,</span> <span class="token operator">...</span>boundArgs<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span><span class="token operator">...</span>args<span class="token punctuation">)</span> <span class="token operator">=></span> fn<span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>context<span class="token punctuation">, [</span><span class="token operator">...</span>boundArgs<span class="token punctuation">,</span> <span class="token operator">...</span>args<span class="token punctuation">]);</span>
</pre><label class="collapse">Show examples</label><pre class="language-js"><span class="token keyword">function</span> <span class="token function">greet</span><span class="token punctuation">(</span>greeting<span class="token punctuation">,</span> punctuation<span class="token punctuation">) {</span>
<span class="token keyword">return</span> greeting <span class="token operator">+</span> <span class="token string">' '</span> <span class="token operator">+</span> <span class="token keyword">this</span><span class="token punctuation">.</span>user <span class="token operator">+</span> punctuation<span class="token punctuation">;
}</span>