Unfortunately, Lua does not have any built-in implementation of shuffle algorithms.
However, there are some easy ones that you can implement or find.
The Fisher-Yates shuffle algorithm is an efficient, reliable, and easy-to-implement algorithm for array randomization.
Here is my optimized implementation of Fisher-Yates in Lua. Feel free to use it as you wish. All you have to do is put the function somewhere and call it on a table in array form that you want to shuffle.
01 | function shuffle(array) |
04 | local random = math.random |
06 | for index = 1, #array do |
07 | local offset = index - 1 |
08 | local value = array[index] |
09 | local randomIndex = offset*random() |
10 | local flooredIndex = randomIndex - randomIndex%1 |
12 | if flooredIndex == offset then |
13 | output[#output + 1] = value |
15 | output[#output + 1] = output[flooredIndex + 1] |
16 | output[flooredIndex + 1] = value |
22 | math.randomseed(tick()) |
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