javascript non-sequential random number generator

Question

does anyone know how to make a non-sequential random number generator in javascript? I know how to do a sequential one using Math.floor(Math.random()*11) where the number will fall in between 0-10. I'm looking for one that will only spit out 65, 83, 68, 70 (these numbers are the character codes for a, s, d, f...I'm making a keyboard game). The only other ones random number generators I've found are biased/non-uniform ones. If you could give me a general direction as to what this is called or even how to make on, it'd be greatly appreciated. Thanks so much!

Here is an interesting source on that: baagoe.com/en/RandomMusings/javascript — Eran Medan
– Eran Medan, Commented Mar 17, 2012 at 0:42

Halcyon · Accepted Answer · 2012-03-17 00:41:30Z

5

Map your codes and just use a consecutive index anyway:

var codes = [ 65, 83, 68, 70 ];
var index = Math.floor(Math.random()*codes.length);
var random_key = codes[index];  // tada!

answered Mar 17, 2012 at 0:41

Halcyon

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Ignacio Vazquez-Abrams · Accepted Answer · 2012-03-17 00:41:34Z

2

js> keymap = Array(65, 83, 68, 70);
[65, 83, 68, 70]
js> print(keymap[Math.floor(Math.random()*4)])
65
js> print(keymap[Math.floor(Math.random()*4)])
70
js> print(keymap[Math.floor(Math.random()*4)])
83
js> print(keymap[Math.floor(Math.random()*4)])
65

answered Mar 17, 2012 at 0:41

Ignacio Vazquez-Abrams

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1 Comment

Dagg Nabbit Over a year ago

Quick, change Array(65, 83, 68, 70) to [65, 83, 68, 70] before someone sees it ;)

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