javascript convert number to string

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

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

var number = 1212
var numberString = number.toString();//converts my number that is '1212' to a string

const num = 123; //> type number 123
const str = num.toString(); //> type string "123"

const toNumber = str => +str;

// Example
toNumber('42');     // 42