Difference between == & === in JavaScript
== Check value only. === Check value and its type also. <! DOCTYPE html > < html lang ="en" xmlns ="http://www.w3.org/1999/xhtml"> < head > < meta charset ="utf-8" /> < title > Difference between == & === in JavaScript </ title > </ head > < body > < script type ="text/javascript"> var b = true ; if (b == 1) // return true { document.writeln( "Check value only" ); } if (b === 1) // return false as variable "b" is boolean type and "1" is number { ...