CODEWITHSUNDEEP
javascriptrandom
kharandziuk
kharandziuk

Reputation: 12900

Reproducible pseudo-random sequence number in JS

I'm making some kind of game with JS. And I want to have an ability to restore game board from previous games. I think I will be able to achieve this behavior if I will have an ability to reproduce sequence of pseudo random numbers. This pseudocode should illustrate my idea: 

var seed = 1; // for example
var random1 = initRandom(seed); // I'm looking for this function initRandom
var random2 = initRandom(seed);
console.assert(random1() === random2()); // both random1 and random2 generates pseudo random numbers
console.assert(random1() === random2());
console.assert(random1() === random2());
console.assert(random1() === random2());
console.assert(random1() === random2()); // I will use those number for board generation

Can somebody propose a way to achieve this behavior?
N.B.: random1 and random2 must be time-independent.

Upvotes: 0

Views: 368

Answers (1)

Jean-Karim Bockstael
Jean-Karim Bockstael

Reputation: 1405

The standard psuedo-random generator in JavaScript is not seedable, but you can implement some standard algorithm or use a library such as https://github.com/skeeto/rng-js by Christopher Wellons.

Upvotes: 1

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