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JS-Array-Slice-&-Splice.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 Array Slice & Splice</title>
<style>
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</head>
<body>
<h1>JS Array Slice & Splice</h1>
<h1>Array slice()</h1>
<p>
The <code>slice()</code> method returns selected elements in an
array, as a new array.
</p>
<p>
The <code>slice()</code> method selects from a
given <em>start</em>, up to a (not inclusive)
given <em>end</em>.
</p>
<p>
The <code>slice()</code> method does not change the original
array.
</p>
<h3>Syntax</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>start<span class="token punctuation">,</span> end<span class="token punctuation">)</span>
</code></pre>
<h3>Parameters</h3>
<table border="2" cellpadding="4">
<tbody>
<tr></tr>
<tr>
<td>Parameter</td>
<td>Description</td>
</tr>
<tr>
<td><em>start</em></td>
<td>
Optional.<br />
Start position. Default is 0.<br />
Negative numbers select from the end of the array.
</td>
</tr>
<tr>
<td><em>end</em></td>
<td>
Optional.<br />
End position. Default is last element.<br />
Negative numbers select from the end of the array.
</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">"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">"Rahul"</span><span class="token punctuation">,</span> <span class="token string">"Karan"</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">slice</span><span class="token punctuation">(</span><span class="token number">1</span> <span class="token punctuation">,</span> <span class="token number">4</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>
<h3> </h3>
<hr />
<h3>Array splice()</h3>
<p>
The <code>splice()</code> method adds and/or removes array
elements.
</p>
<p>
The <code>splice()</code> method overwrites the original array.
</p>
<hr />
<h3>Syntax</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">array<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> howmany<span class="token punctuation">,</span> item1<span class="token punctuation">,</span> <span class="token operator">...</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">,</span> itemX<span class="token punctuation">)</span>
</code></pre>
<h3>Parameters</h3>
<table border="2" cellpadding="4">
<tbody>
<tr></tr>
<tr>
<td>Parameter</td>
<td>Description</td>
</tr>
<tr>
<td><em>index</em></td>
<td>
Required.<br />
The position to add/remove items.<br />
Negative value defines the position from the end of the array.
</td>
</tr>
<tr>
<td><em>howmany</em></td>
<td>
Optional.<br />
Number of items to be removed.
</td>
</tr>
<tr>
<td><em>item1</em>, ..., <em>itemX</em></td>
<td>
Optional.<br />
New elements(s) to be added.
</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">"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">"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>
a<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token string">"Neha"</span><span class="token punctuation">,</span><span class="token string">"Karan"</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 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>
document.write("<h3>SLICE</h3>");
let slice = [" Hamza Khan Lodhi ", " Umar Hayat Khan Lodhi ", " Zaid "];
let slice2 = slice.slice(1, 3);
document.write(slice2);
document.write("<h3>SPLICE</h3>");
let a = [" Hamza Khan Lodhi ", " Umar Hayat Khan Lodhi ", " Zaid "];
a.splice(0, 1, "HEllo", "!");
document.write(a);
</script>
</html>