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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 Multidimensional Arrays</title>
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<body>
<h1>JS Multidimensional Arrays</h1>
<p>
Multidimensional arrays are not directly provided in JavaScript. If we
want to use anything which acts as a multidimensional array then we need
to create a multidimensional array by using another one-dimensional array.
So multidimensional arrays in JavaScript is known as arrays inside another
array. We need to put some arrays inside an array, then the total thing is
working like a multidimensional array. The array, in which the other
arrays are going to insert, that array is use as the multidimensional
array in our code. To define a multidimensional array its exactly the same
as defining a normal one-dimensional array.
</p>
<h1>One-Dimensional array:</h1>
<p>var arr = []; // Empty 1D array</p>
<p>var arr1 = ["A", "B", "C", "D"] // 1D array contains some alphabets</p>
<p>var arr1 = [1, 2, 3, 4, 5] // 1D array contains some digits</p>
<hr />
<h1>Multidimensional-Dimensional array:</h1>
<h1>Method 1:</h1>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">1st<span class="token punctuation">,</span> need to define some 1D array
<span class="token keyword">var</span> arr1 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"ABC"</span><span class="token punctuation">,</span> <span class="token number">24</span><span class="token punctuation">,</span> <span class="token number">18000</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> arr2 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"EFG"</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">30000</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> arr3 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"IJK"</span><span class="token punctuation">,</span> <span class="token number">28</span><span class="token punctuation">,</span> <span class="token number">41000</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> arr4 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"EFG"</span><span class="token punctuation">,</span> <span class="token number">31</span><span class="token punctuation">,</span> <span class="token number">28000</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> arr5 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">"EFG"</span><span class="token punctuation">,</span> <span class="token number">29</span><span class="token punctuation">,</span> <span class="token number">35000</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token comment">// "salary" defines like a 1D array but it already contains some 1D array</span>
<span class="token keyword">var</span> salary <span class="token operator">=</span> <span class="token punctuation">[</span>arr1<span class="token punctuation">,</span> arr2<span class="token punctuation">,</span> arr3<span class="token punctuation">,</span> arr4<span class="token punctuation">,</span> arr5<span class="token punctuation">]</span><span class="token punctuation">;</span> </code></pre>
<p>
1st, need to define some 1D array var arr1 = ["ABC", 24, 18000]; var arr2
= ["EFG", 30, 30000]; var arr3 = ["IJK", 28, 41000]; var arr4 = ["EFG",
31, 28000]; var arr5 = ["EFG", 29, 35000]; // "salary" defines like a 1D
array but it already contains some 1D array var salary = [arr1, arr2,
arr3, arr4, arr5];
</p>
<p>
Here arr1, arr2, …arr5 are some 1D arrays that are inside salary array.
</p>
<h1>Method 2:</h1>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token keyword">var</span> salary <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">[</span><span class="token string">"ABC"</span><span class="token punctuation">,</span> <span class="token number">24</span><span class="token punctuation">,</span> <span class="token number">18000</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"EFG"</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">30000</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"IJK"</span><span class="token punctuation">,</span> <span class="token number">28</span><span class="token punctuation">,</span> <span class="token number">41000</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"EFG"</span><span class="token punctuation">,</span> <span class="token number">31</span><span class="token punctuation">,</span> <span class="token number">28000</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">]</span><span class="token punctuation">;</span>
</code></pre>
<p>
Here, salary array works like a multidimensional array. This notations are
known as array literals.
</p>
<h1>Accessing the element of salary array:</h1>
<ul>
<li>To access the array element we need a simple index-based notation</li>
</ul>
<p>// This notation access the salary of "ABC" person which is 18000,</p>
<p>// [0] selects 1st row, and [2] selects the 3rd element</p>
<p>// of that 1st row which is 18000</p>
<p>salary[0][2];</p>
<br /><br />
<p>// Similarly,</p>
<p>salary[3][2]; // Selects 28000</p>
<p>**This notation is used for both Method 1 and Method 2.</p>
<ul>
<li>For many iteration, we need to use loop to access the elements,</li>
</ul>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token comment">// This loop is for outer array</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> l1 <span class="token operator">=</span> salary<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i <span class="token operator"><</span> l1<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">// This loop is for inner-arrays</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> j <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> l2 <span class="token operator">=</span> salary<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> j <span class="token operator"><</span> l2<span class="token punctuation">;</span> j<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Accessing each elements of inner-array</span>
documents<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span> salary<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span>j<span class="token punctuation">]</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<hr />
<h1>Adding elements in Multidimensional Array:</h1>
<p>
Adding elements in multi-dimensional arrays can be achieved in two ways in
inner array or outer array. The inner array can be done in two different
ways.
</p>
<h1>Adding elements to inner array:</h1>
<p>
We can use simple square bracket notation to add elements in
multidimensional array.
</p>
<p>salary[3][3] = "Pakistan";</p>
<br /><br /><br />
<p>// It adds "Pakistan" at the 4th index of 4th sub-array,</p>
<p>// If we print the entire 4th sub-array, document.write(salary[3]);</p>
<p>// the output will be : ["EFG", 31, 28000, "Pakistan"]</p>
<p>// indexing starts from 0</p>
<ul>
<li>We can use push() method to add elements in the array.</li>
</ul>
<p>salary[3].push("Pakistan", "Karachi");</p>
<p>// It add "Pakistan" at the 4th index and "karachi" at</p>
<p>// 5th index of 4th sub-array</p>
<p>// If we print the entire 4th sub-array,</p>
<p>// document.write(salary[3]);</p>
<p>// The output will be : ["EFG", 31, 28000, "Pakistan", "Karachi"]</p>
<p>// Indexing starts from 0</p>
<ul>
<li>Adding elements to outer array:</li>
</ul>
<p>It is much similar to previous methods.</p>
<p>salary.push(["MNO", 29, 33300]);</p>
<p>// This row added after the last row in the "salary" array</p>
<hr />
<h1>Removing elements in Multidimensional Array:</h1>
<p>
We can use pop() methods to remove elements from inner-arrays, and also
use pop() method for removing a entire inner array.
</p>
<p>// Remove last element from 4th sub-array</p>
<p>// That is 28000 indexing starts from 0</p>
<p>salary[3].pop();</p>
<p>// Removes last sub-array</p>
<p>// That is "["EFG", 31, 28000]"</p>
<p>salary.pop();</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>
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<span class="token punctuation">[</span><span class="token string">"Sunny"</span><span class="token punctuation">,</span><span class="token number">19</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"BCA"</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
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<span class="token punctuation">[</span><span class="token string">"Tom"</span><span class="token punctuation">,</span><span class="token number">17</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"B.A."</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"Mac"</span><span class="token punctuation">,</span><span class="token number">17</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"B.A."</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">"<table border='1px' cellspacing='0'>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> a <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> a <span class="token operator"><</span> <span class="token number">5</span><span class="token punctuation">;</span> a<span class="token operator">++</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">"<tr>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> b<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span> b <span class="token operator"><</span> <span class="token number">4</span><span class="token punctuation">;</span> b<span class="token operator">++</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">"<td>"</span> <span class="token operator">+</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span><span class="token punctuation">[</span>b<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">"</td>"</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">"</tr>"</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">"</table>"</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 />
<h1>With Array Length</h1>
<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> ary <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">[</span><span class="token string">"Harry"</span><span class="token punctuation">,</span><span class="token number">18</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"B.Com"</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"Sunny"</span><span class="token punctuation">,</span><span class="token number">19</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"BCA"</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"Sarah"</span><span class="token punctuation">,</span><span class="token number">18</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"BCA"</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"Tom"</span><span class="token punctuation">,</span><span class="token number">17</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"B.A."</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">"Mac"</span><span class="token punctuation">,</span><span class="token number">17</span><span class="token punctuation">,</span><span class="token string">"Male"</span><span class="token punctuation">,</span><span class="token string">"B.A."</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>ary<span class="token punctuation">.</span>length<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">"<table border='1px' cellspacing='0'>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> a <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> a <span class="token operator"><</span> ary<span class="token punctuation">.</span>length<span class="token punctuation">;</span> a<span class="token operator">++</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">"<tr>"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> b<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span> b <span class="token operator"><</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> b<span class="token operator">++</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">"<td>"</span> <span class="token operator">+</span> ary<span class="token punctuation">[</span>a<span class="token punctuation">]</span><span class="token punctuation">[</span>b<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">"</td>"</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">"</tr>"</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">"</table>"</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 data = [
["Hamza Khan Lodhi", "14", "Male", "BCOM"],
["Rashida Khan Lodhi", "14", "Female", "BCOM"],
["Umar Khan Lodhi", "14", "Male", "BCOM"],
["Rehman Khan Lodhi", "14", "Male", "BCOM"],
["Zubair Khan Lodhi", "14", "Male", "BCOM"],
["Raheem Khan Lodhi", "14", "Male", "BCOM"],
["Irfan Khan Lodhi", "14", "Male", "BCOM"],
["Ali Khan Lodhi", "14", "Male", "BCOM"],
["Hafsa Khan Lodhi", "14", "Female", "BCOM"],
];
let c = prompt("");
for (let a = 0; a < data.length; a++) {
for (let b = 0; b < 4; b++) {
if (data[a][b] == c) {
document.write(
data[a][0] + " " + data[a][1] + " " + data[a][2] + " " + data[a][3]
);
alert("Data Founded");
}
}
document.write("<br>");
}
</script>
</html>