how to check if a number is an int javascript code example

Example 1: integer check in javascript

var a=Number.isInteger(5); //True
var b= Number.isInteger(01); //True
var c=Number.isInteger("10"); //False

console.log(a,b,c);  //true true false

Example 2: how to check if a string is an integer javascript

isNaN(num)         // returns true if the variable does NOT contain a valid number