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

Answer 2

Use

var value = "" + 5 + 6;

to force it to strings.

Answer 3

You can return a number by using this trick:
not recommended

[a] + b - 0

Example :

let output = [5] + 6 - 0;
console.log(output); // 56
console.log(typeof output); // number

Answer 4

var value = "" + 5 + 6;
alert(value);