function countChars(chars) {
  var counts = {};

  for (var char of chars) {
    if (typeof counts[char] === 'undefined') {
      counts[char] = 1;
    }
    else {
      counts[char]++;
    }
  }

  return counts;
}

function scramble(haystack, needle) {
    haystack = haystack.split('')
    needle = needle.split('')

    var chars = countChars(haystack);

    for(char of needle) {
      if (typeof chars[char] === 'undefined')
      {
        return false;
      }

      chars[char]--;

      if (chars[char] < 0)
      {
          return false;
      }
    }

    return true;
}