type checking in javascript

Question

How can I check if a variable is currently an integer type? I\'ve looked for some sort of resource for this and I think the === operator is important, but I\'m not sure how

Answer 1

A number is an integer if its modulo %1 is 0-

function isInt(n){
    return (typeof n== 'number' && n%1== 0);
}

This is only as good as javascript gets- say +- ten to the 15th.

isInt(Math.pow(2,50)+.1) returns true, as does Math.pow(2,50)+.1 == Math.pow(2,50)