Check that variable is a number

Question

How can I check that a variable is a number, either an integer or a string digit?

In PHP I could do:

if (is_int($var)) {
    echo \'$var is integer\'         


        

Answer 1

You should use:

var x = 23;
var y = 34hhj;

isNaN(x); 
isNaN(y); 

It will return true if its string and false if its a number.