My solution for CTF Challenge: text2numbers https://jacobedelman.gitbooks.io/hsctf-3-practice-problems/content/text2numbers-problem.html

text2numbers.js

var dictionary = ["0","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"," ","_" ]

var the_flag_key = [23, 5, 12, 12, 27, 20, 8, 5, 27, 6, 12, 1, 7, 27, 9, 19, 27, 8, 9, 4, 4, 5, 14, 27, 8, 5, 18, 5, 27, 2, 21, 20, 27, 6, 9, 18, 19, 20, 27, 23, 5, 27, 8, 1, 22, 5, 27, 19, 15, 13, 5, 27, 20, 5, 24, 20, 27, 20, 15, 27, 3, 15, 14, 6, 21, 19, 5, 27, 25, 15, 21, 27, 14, 15, 23, 27, 20, 8, 5, 27, 6, 12, 1, 7, 27, 9, 19, 27, 9, 14, 27, 6, 1, 3, 20, 27, 19, 5, 3, 18, 5, 20, 19, 28, 1, 18, 5, 28, 8, 9, 4, 4, 5, 14, 28, 9, 14, 28, 20, 8, 9, 19, 28, 12, 9, 19, 20, 27, 4, 15, 14, 20, 27, 9, 14, 3, 12, 21, 4, 5, 27, 20, 8, 5, 27, 16, 1, 18, 20, 19, 27, 20, 8, 1, 20, 27, 1, 18, 5, 27, 19, 5, 16, 5, 18, 1, 20, 5, 4, 27, 23, 9, 20, 8, 27, 19, 16, 1, 3, 5, 19]

console.log(the_flag_key.map(x => dictionary[x]).join(""))