Reversed Binary Numbers

gistfile1.js

/*
Task
Your task will be to write a program for reversing numbers in binary.
For instance, the binary representation of 13 is 1101,
and reversing it gives 1011, which corresponds to number 11.

Input
The input contains a single line with an integer N, 1 ≤ N ≤ 1000000000.

Output
Output one line with one integer,
the number we get by reversing the binary representation of N.
*/

function reverseBinary(num) {
  return parseInt(
    num
    .toString(2)
    .split('')
    .reverse()
    .join(''),
  2);
}