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jQuery Difference between == and === in JavaScript with Example

Jan 11, 2016
Introduction

Here I will explain difference between == and === in
JavaScript with example or what is the difference between == and === in jQuery with example. Generally JavaScript will provide different type of operators those are strict equality (===) and type converting equality (==). These operators help us to understand difference between == and === in JavaScript or jQuery.

Description:
  
In previous articles I explained jQuery bootstrap autocomplete textbox from database example, jQuery slideup, slidedown and slidetoggle example, jQuery autocomplete with images in asp.net,
jQuery hide div if we click outside of it example and many articles relating to css, AngularJS, jQuery, JavaScript and asp.net. Now I will explain difference between == and === in JavaScript or jQuery with example.

Generally JavaScript will provide different type of operators those are strict equality and type converting equality.

Strict equality (===) means values which we are comparing must have same type that means "2" not equal to 2 ("2"===2 it will return false).

Type converting equality (==) means automatically it will covert variable to value either it's string or number that means "2" is equal to 2 ("2" == 2 it will return true)

Here double equal (==) is an auto type converting equality and three equal (===) is strict equality operator that means it will not covert values automatically.

Here we will learn with simple examples

Example1


1=="1" // it will return true because here string will converted as number
1 === "1" // it will return false because here 1 is number and "1" is string

Example2


0 == false // it will return true because here false is equivalent of 0
0 === false // it will return false because both are different operands

If you want to check it in complete example you need to write the code like as shown below


<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>difference between == and === in javascript</title>
<script type="text/javascript">
function Checkdiff() {
var tstval = "2";
if (tstval == 2)
document.write("== Condition reutrns true <br/>")
else
document.write("== Condition reutrns false <br/>")
if (tstval === 2)
document.write("=== Condition reutrns true <br/>")
else
document.write("=== Condition reutrns false <br/>")
}
</script>
</head>
<body>
<div>
<input type="button" id="btncheck" onclick="Checkdiff()" value="Check Difference" />
</div>
</body>
</html>

Live Demo

Check following demo to check difference between == and === in jQuery




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3 comments :

Prajesh Dasari said...

Very simple and good one. Thank you.

sarath said...

Good one..

Omid Nasri said...

Good one.

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