https://64605415f610243ceba1d66f--rad-kitten-1e7554.netlify.app/

add-binary.js

var addBinary = function(a, b) {
  let binaryStringA = a.split('').reverse()
  let binaryStringB = b.split('').reverse()
  
  let valA = 0n
  for (let i = 0n; i < binaryStringA.length; i++) {
    if (binaryStringA[i] == 1) valA += 2n ** i
  }
  
  let valB = 0n
  for (let i = 0n; i < binaryStringB.length; i++) {
    if (binaryStringB[i] == 1) valB += 2n ** i
  }
  
  return (valA + valB).toString(2)
};