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JS-Functions.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
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<title>JS Functions</title>
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<body>
<h1>JavaScript Functions</h1>
<p>
JavaScript functions are used to perform operations. We can call
JavaScript function many times to reuse the code.
</p>
<p>Advantage of JavaScript function</p>
<p>There are mainly two advantages of JavaScript functions.</p>
<ol>
<li>
Code reusability: We can call a function several times so it save
coding.
</li>
<li>
Less coding: It makes our program compact. We don’t need to write many
lines of code each time to perform a common task.
</li>
</ol>
<h1>JavaScript Function Syntax</h1>
<p>The syntax of declaring function is given below.</p>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token keyword">function</span> <span class="token function">functionName</span><span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">[</span>arg1<span class="token punctuation">,</span> arg2<span class="token punctuation">,</span> <span class="token operator">...</span>argN<span class="token punctuation">]</span></span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//code to be executed </span>
<span class="token punctuation">}</span> </code></pre>
<p>JavaScript Functions can have 0 or more arguments.</p>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">function</span> <span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Hello Everybody"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">function</span> <span class="token function">yahoo</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Yahoo Baba"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"</br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">yahoo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"</br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"</br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">hello</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre>
</body>
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