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JS-forEach-Loop.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS forEach Loop</title>
<style>
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<body>
<p>
The <code>forEach()</code> method calls a function for each
element in an array.
</p>
<p>
The <code>forEach()</code> 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 <code>undefined</code>.<br />
A value passed to the function as
its <code>this</code> 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"><!</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">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">"<br>"</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"></</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>
<hr />
<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">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">"<br>"</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>
<hr />
</body>
<script>
let ary = ["Hamza Khan", "Uamr Hayat", "Zaid", "Zahid"];
ary.forEach((value, index) => {
document.write(index + " : " + value + "<br>");
});
</script>
</html>