Function addBinary

math/67-add-binary.js:6–11

(a, b)

 * @return {string}
 */
var addBinary = function (a, b) {
  // we used BigInt() to convert binary to Integer. Syntax is BigInt(0b11) here `0b` is prefix and `11` is binary number
  let sum = BigInt(`0b${a}`) + BigInt(`0b${b}`);
  // sum is converted back to string using toString(2), here 2 is radix argument, so toString(2) converts to binary
  return sum.toString(2);
};