How can I get all possible characters in JavaScript?

Question

Suppose all the characters in JavaScript were a, b, c, d, e and f. What I'm trying to do is create a random mapping between characters. So the above might be like

{ `a` : `e`,
  `b` : `b`, 
  `c` : `e`, 
  `d` : `b`,
  `e` : `a`,
  `f` : `c` }

First, how can I get all the possible characters in JavaScript?

var AllChars = new Array(); 
// ... fill AllChars with the full range of characters

Possible duplicate of [How to randomize (shuffle) a JavaScript array?](http://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array) — Oriol, Jan 21 '16 at 16:35
*get all the possible characters* Do you even know how many there are in Unicode? — Derek 朕會功夫, Jan 21 '16 at 16:38
Normally, when you want a random mapping between characters, you don't actually put all characters in a map. You make a pseudo-random function that takes a character as an argument and returns the character it maps to. This is a simple form of encryption. — Matt Timmermans, Jan 21 '16 at 18:48
@Derek朕會功夫 kinda like a hashing function, but bijective. A pseudo-random permutation of characters instead of a general pseudo-random function. You can make these out of hash functions using the Fiestel structure, for example: https://en.wikipedia.org/wiki/Feistel_cipher — Matt Timmermans, Jan 21 '16 at 20:20

Javier Conde · Accepted Answer · 2016-01-22T15:12:38.317

Here is an example on how to generate an array with all the lowercase letters:

var AllChars = [];
for (var i=97; i<123; i++)
    AllChars.push(String.fromCharCode(i));

["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"]

Edit to include all ascii printable characters per Aaron recommendation:

var AllChars = [];
for (var i=32; i<127; i++)
  AllChars.push(String.fromCharCode(i));

[" ", "!", """, "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", ".", "/", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ":", ";", "<", "=", ">", "?", "@", "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", "[", "\", "]", "^", "_", "`", "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", "{", "|", "}", "~"]

You could also add to your answer to retrieve all ascii printable characters. They're the 32-126 range. — Aaron, Jan 22 '16 at 09:16
Done :) I've also changed the index access by `push` when populating the array to make it easier. — Javier Conde, Jan 22 '16 at 15:14

score 2 · Answer 2 · answered Jan 16 '20 at 16:18

2

Here is a one liner for all lowercase chars:

Array(26)
    .fill(97)
    .map((x, y) => String.fromCharCode(x + y))

answered Jan 16 '20 at 16:18

Enki

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How can I get all possible characters in JavaScript?

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