how to check if string is integer in javascript code example

Example 1: how to check if a string is an integer javascript

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

Example 2: js check if string or int

var myString     =  "abc123";
var otherString  =  "123";
/* isInterger() checks if an value repersents an int  */

Number.isInteger(myString);    //returns false
Number.isInteger(otherString); //returns true