Convert to Binary.js

/*
Description:
Task Overview
Given a non-negative integer n, write a function toBinary/ToBinary which returns that number in a binary format.

to_binary(1)  /* should return 1 */
to_binary(5)  /* should return 101 */
to_binary(11) /* should return 1011 */
*/

let toBinary = n => +n.toString(2)