Seedable Math.random compatible pseudorandom number generator
var random = require('seedable-random');
random.seed(123);
console.log(random());
Math.random
replacementMath.random = require('seedable-random');
Math.random.seed(12345);
Works as a drop-in for Math.random
Relatively fast (about 2.5 times slower than Math.random
on my machine)
Seeds itself from the clock by default
Tries to be pretty random
Well tested (TODO come up with some PRNG torture tests)
Possibility to switch the generator (linear-feedback shift register, Mersenne twister, digits of Math.sin(), etc. based on your needs)
Current implementation just calls Math.sin() with the seed. It's likely that it's not quite that random (for example, the distribution could be biased towards numbers near 1.0). Some more tests are needed.