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Write the main difference between '==' and '===' operators in javascript?
The difference between '==' and '===' is that former checks only value but the latter checks value and also data type(String, Boolean etc).The following example gives whether values assigned are equal or not irrespective of datatype.
a) "==" operator(checks equality)
Example
<html> <body> <p id="strict"></p> <script> var x = 5; var y = 5; var z = 6; document.getElementById("strict").innerHTML = (x == y) + "<br>" + (x == z); </script> </body> </html> Output
true false
b) '===' operator (Checks strict equality)
"===" operator gives true if and only if both value and data type are equal.If not it returns false.In the following example every variable(x,y,z) has assigned value 5 but some of them were given string data type(variables y and z).When we strict equals x and y we get false because variable y is assigned string data type whereas variable x is not.
Example
<html> <body> <p id="strict"></p> <script> var x = 5; var y = "5"; var z = "5"; document.getElementById("strict").innerHTML = (x === y) + "<br>" + (x == z); </script> </body> </html> Output
false true
Updated on: 2019-07-30T22:30:26+05:30
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