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Posted 22 Feb 2011
Licenced CPOL

Javascript Operators === & !==

, 28 Feb 2011
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Javascript Operators === & !==
The following example will demonstrate the Tip:
var x;
x = 0;
var y;
y = '0';

x is numeric, while y is char.

On comparing them using the "==" operator, it will give true !
alert('x == y : ' + (x==y));

To do so, we will use the '===' operator:
alert('x === y : ' + (x===y));

which checks on the Value and Type, so it will give false.

Same for the !== operator.
alert('x != y: '; + (x != y));

it gives false !!
alert('x !== y: '; + (x !== y));

it gives true

So, to assure an accurate comparison datatype and value don't use the normal operators == and != but use === and !== operators.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Antoun Gorgy
Software Developer
Egypt Egypt
- BSc Computer Engineering
Ain Shams University - Faculty of Engineering

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Comments and Discussions

GeneralOperator Use == returns true if values o... Pin
r verma23-Feb-11 16:43
memberr verma23-Feb-11 16:43 

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