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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 Array index</title>
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<body>
<h1>JS Array index</h1>
<h1>Array indexOf()</h1>
<p>
The JavaScript Array indexOf() Method is used to find the index of the
first occurrence of the search element provided as the argument to the
method. This method always compares the search element to the element
present in the array using strict equality. Therefore, when the search
element is NaN then it returns -1 because NaN values are never compared as
equal.
</p>
<h3>Syntax:</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">array<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span>element<span class="token punctuation">,</span> start<span class="token punctuation">)</span></code></pre>
<p>
<br />
<strong>Parameters:</strong> This method accepts two parameters as
mentioned above and described below:
</p>
<ul>
<li>
<strong>element:</strong> This parameter holds the element whose
index will be returned.
</li>
<li>
<strong>start:</strong> This parameter is optional and it holds the
starting point of the array, where to begin the search the default value
is 0.
</li>
</ul>
<p>
<strong>Return value:</strong> This method returns the index of the
first occurrence of the element. If the element cannot be found in the
array, then this method returns -1.<br />
</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">var</span> a <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"Sanjay"</span><span class="token punctuation">,</span> <span class="token string">"Aman"</span><span class="token punctuation">,</span> <span class="token string">"Rehman"</span><span class="token punctuation">,</span> <span class="token string">"Aman"</span><span class="token punctuation">,</span> <span class="token string">"Rahul"</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>a <span class="token operator">+</span> <span class="token string">"<br><br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> b <span class="token operator">=</span> a<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">"Aman"</span><span class="token punctuation">,</span><span class="token number">2</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>b<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 />
<h3>Array lastIndexOf()</h3>
<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">"Sanjay"</span><span class="token punctuation">,</span> <span class="token string">"Aman"</span><span class="token punctuation">,</span> <span class="token string">"Rehman"</span><span class="token punctuation">,</span> <span class="token string">"Aman"</span><span class="token punctuation">,</span> <span class="token string">"Rahul"</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>a <span class="token operator">+</span> <span class="token string">"<br><br>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> c <span class="token operator">=</span> a<span class="token punctuation">.</span><span class="token function">lastIndexOf</span><span class="token punctuation">(</span><span class="token string">"Aman"</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>c <span class="token operator">+</span> <span class="token string">"<br><br>"</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>
<script>
let ary = [
"Zahid Khan",
"Hamza Khan Lodhi",
"Umar Hayat Khan Lodhi",
"Zahid Khan",
"Zaid",
];
let b = ary.indexOf("Zahid Khan", 2);
document.write(b);
</script>
</html>