Java Script Data Type - tccicomputercoaching.com

Data Type is used to categorized data into various categories: because machine can not differentiate data like 5, 78.90, x, "Hello", *, % etc. All these data are not same.

JavaScript variables can hold many data types: numbers, strings, objects and more:

var length = 16; // Number
 
var lastName = "Johnson"; // String
 
var x = {firstName:"John", lastName:"Doe"}; // Object

When adding a number and a string, JavaScript will treat the number as a string.

Example

var x = 16 + "car";

x=16car

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