JS-Functions.html

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    <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">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</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">"&lt;/br&gt;"</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">"&lt;/br&gt;"</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">"&lt;/br&gt;"</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">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span></code></pre>
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