kata-7-solution-string-scramble.js

// ************************************************************************************
// https://www.codewars.com/kata/5822d89270ca28c85c0000f3/javascript

// Given a string and an array of index numbers, return the characters of the string
// rearranged to be in the order specified by the accompanying array.

// Ex:
// scramble('abcd', [0,3,1,2]) -> 'acdb'

// The string that you will be returning back will have: 'a' at index 0, 'b' at index 3,
// 'c' at index 1, 'd' at index 2, because the order of those characters maps to their
// corresponding numbers in the index array.

// In other words, put the first character in the string at the index described by the
// first element of the array.

// You can assume that you will be given a string and array of equal length and both
// containing valid characters (A-Z, a-z, or 0-9).
// ************************************************************************************

function scramble(str, arr) {
  const result = [];
  arr.forEach((e, idx) => {
    result[e] = str[idx];
  });
  return result.join('');
}