JS-forEach-Loop.html

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    <p>
      The&nbsp;<code>forEach()</code>&nbsp;method calls a function for each
      element in an array.
    </p>
    <p>
      The&nbsp;<code>forEach()</code>&nbsp;method is not executed for empty
      elements.
    </p>
    <h3>Syntax</h3>
    <pre
      class="language-javascript"
      tabindex="0"
    ><code class="language-javascript">array<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">currentValue<span class="token punctuation">,</span> index<span class="token punctuation">,</span> arr</span><span class="token punctuation">)</span><span class="token punctuation">,</span> thisValue<span class="token punctuation">)</span></code></pre>
    <h3>Parameters</h3>
    <table class="table table-bordered table-striped">
      <tbody>
        <tr>
          <td><em>function()</em></td>
          <td>
            Required.<br />
            A function to run for each array element.
          </td>
        </tr>
        <tr>
          <td><em>currentValue</em></td>
          <td>
            Required.<br />
            The value of the current element.
          </td>
        </tr>
        <tr>
          <td><em>index</em></td>
          <td>
            Optional.<br />
            The index of the current element.
          </td>
        </tr>
        <tr>
          <td><em>arr</em></td>
          <td>
            Optional.<br />
            The array of the current element.
          </td>
        </tr>
        <tr>
          <td><em>thisValue</em></td>
          <td>
            Optional. Default&nbsp;<code>undefined</code>.<br />
            A value passed to the function as
            its&nbsp;<code>this</code>&nbsp;value.
          </td>
        </tr>
      </tbody>
    </table>
    <h3>Return Value</h3>
    <table class="table table-bordered table-striped">
      <tbody>
        <tr>
          <td>undefined</td>
        </tr>
      </tbody>
    </table>
    <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">var</span> a <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"Rahul"</span><span class="token punctuation">,</span><span class="token string">"Karan"</span><span class="token punctuation">,</span><span class="token string">"Aman"</span><span class="token punctuation">,</span><span class="token string">"Neha"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
	a<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">value<span class="token punctuation">,</span>index</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>index <span class="token operator">+</span> <span class="token string">" : "</span> <span class="token operator">+</span> value <span class="token operator">+</span> <span class="token string">"&lt;br&gt;"</span><span class="token punctuation">)</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>
    <hr />
    <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">var</span> a <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"Rahul"</span><span class="token punctuation">,</span><span class="token string">"Karan"</span><span class="token punctuation">,</span><span class="token string">"Aman"</span><span class="token punctuation">,</span><span class="token string">"Neha"</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    a<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>loop<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">function</span> <span class="token function">loop</span><span class="token punctuation">(</span><span class="token parameter">value<span class="token punctuation">,</span> index</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>index <span class="token operator">+</span> <span class="token string">" : "</span> <span class="token operator">+</span> value <span class="token operator">+</span> <span class="token string">"&lt;br&gt;"</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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