Binary Search Generator Thingy

locate.js

function* locate(low, high) {
  var mid;
  if (high === Infinity || high === undefined) {
    mid = 1;
    for (;;) {
      if ((yield mid) > 0) {
        mid <<= 1;
      } else {
        high = mid << 1;
        break;
      }
    }
  }
  while (low < high) {
    mid = (low + high) >>> 1;
    (yield mid) > 0 ? (low = mid + 1) : (high = mid);
  }
  return low;
}