1var myNumber=120;
2var myString = myNumber.toString(); //converts number to string "120"

1num.toString();

1var num = 15;
2var n = num.toString(); /* now */ "15"

1var num = 15;
2var n = num.toString();

1const num = 2
2const a = num.toString() // This throws an Error if num is null or undifined
3const b = String(num) // In a case above, puts "null" or "undifined"

1let a = '' + 50 // '50';