How to concatenate two numbers in javascript?

Question

I\'d like for something like 5 + 6 to return \"56\" instead of 11.

Answer 1

enter code here
var a = 9821099923;
var b = 91;
alert ("" + b + a); 
// after concating , result is 919821099923 but its is now converted 
into string  

console.log(Number.isInteger("" + b + a))  // false

 you have to do something like below:- 

var c= parseInt("" + b + a)
console.log(c); // 919821099923
console.log(Number.isInteger(c)) // true