Arrays in JavaScript - JavaScript Tutorial 96

Published: 22 February 2022
on channel: ChidresTechTutorials

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Notes for You:: Arrays in JavaScript - JavaScript Tutorial 96

Array:
Array is a collection of data elements (or data values).
Arrays are created to store multiple values in a single variable.

Note:
Each element in the array is going to have an index; hence arrays are also called as indexed variables.
Arrays follow 0 based indexing; i.e. first element in the array is going to have an index 0.

How to declare and initialize a variable of type array:

Syntax 1: using constructor notation
var arrayName = new Array(comma separated list of values);
Ex:
var studNames = new Array(“Ram”,”Ravi”,”Raju”,”Raghu”,”Gopal”);

Syntax 2: using literal notation
var arrayName = [comma separated list of values];
Ex:
var studNames = [“Ram”,”Ravi”,”Raju”,”Raghu”,”Gopal”];

How to get value of an array element:
We can get value of an array element by its index.

Syntax:
arrayName[index]

Ex:
document.write( studNames[0] ); // Ram

How to set new value to an array element:
We can set new value to an array element using assignment operator.

Syntax:
arrayname[index] = newvalue;

Ex:
studNames[0]=”Rahul”;
document.write(studNames[0]); // Rahul

Example Code:
// var studNames = new Array("Ram","Ravi","Raju","Raghu","Gopal");

var studNames = ["Ram","Ravi","Raju","Raghu","Gopal"];

document.write( studNames[0] ); // Ram
document.write( studNames[1] ); // Ravi
document.write( studNames[2] ); // Raju
document.write( studNames[3] ); // Raghu
document.write( studNames[4] ); // Gopal

studNames[0] = "Rahul";

document.write( studNames[0] ); // Rahul
document.write( studNames[1] ); // Ravi
document.write( studNames[2] ); // Raju
document.write( studNames[3] ); // Raghu
document.write( studNames[4] ); // Gopal

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