How do I check if a JavaScript parameter is a number?

Question

I\'m doing some trouble-shooting and want to add a check that a parameter to a function is a number. How do I do this?

Something like this...

function fn         


        

Answer 1

=== means strictly equals to and == checks if values are equal. that means "2"==2 is true but "2"===2 is false.

using regular expression

var intRegex = /^\d+$/;
if(intRegex.test(num1)) { 
//num1 is a valid integer
}

example of == vs. ===