JavaScript – Exercise 12 – Arrays

JavaScript arrays can hold different types of data unlike other programming languages like C, C++, and Java. In this article, you will create a simple array and store elements in the array.

Structure of array declaration

To declare an array in JavaScript use following syntax.

arrayName = [];  //declare an empty array

arrayName = [23, "Car", 45.66, 'B'];   //Assign values later 

Or

var arr = [34,56,77,2,6];

JavaScript push() and pop() method

You can use JavaScript arrays like a stack. You can push element using the push() method or delete an element from the array.

Elements from array are pushed or deleted from the rear end of the array. You can consider the rear end of the array as top of stack.

var arr = [44,55,66,77];

// calling push function to insert 88

arr.push(88);

// calling push function to insert 100

arr.push(100);

// display the array

console.log(arr);

// delete an element using pop() function 

arr.pop();

// display array

console.log(arr);

Two Dimensional Array

JavaScript allows you to create a multidimensional array. The two dimensional array has rows and columns. To create a two dimensional array use following syntax.

var arrTwoDimensional = [ [2,5],[3,6],[,4,8] ];

arrTwoDimensional.push([5,10]);

Example Program:

<!DOCTYPE html>
<html>
<head>
  <title>JavaScript - Array Stack</title>
  <meta charset = "utf-8">
 </head>
 <body>
 
<script>
var arr = [44,55,66,77];

 // calling push function to insert 88

 arr.push(88);

 // calling push function to insert 100

 arr.push(100);

 // display the array

 document.write(arr + "<br>");

 // delete an element using pop() function 

 arr.pop();

 // display array
 document.write(arr + "<br>");

var arrtwoDimensional = [[2,3],[4,5],[6,7]];

arrtwoDimensional.push([8,9] + "<br>");

document.write(arrtwoDimensional);
</script>
 </body>
 </html>

Output – JavaScript Arrays

Output-Exercise12-JavaScript Arrays
Output – JavaScript Arrays

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