Random¶

1 min read

Import: import system;

`Random`¶

Seedable xorshift32 PRNG.

public class Random

Creates a generator from seed (0 is remapped to 1 so the state is never zero).

public constructor(seed: uint)

Advances the generator and returns the next 32-bit value.

public fun next_u32(): uint

Uniform integer in [0, bound) when bound > 0, otherwise 0.

public fun next_int(bound: int): int

Uniform value in [0.0, 1.0) at full 32-bit resolution (no quantization or modulo bias).

public fun next_double(): double

True or false with equal probability.

public fun next_bool(): bool

Uniform 64-bit value from two independent 32-bit draws, composed exactly (may be negative when viewed as signed).

public fun next_long(): long

Generates n pseudorandom bytes; negative lengths produce an empty array.

public fun next_bytes(n: int): byte[]

Selects a uniformly bounded index from list, or returns None for an empty list.

public fun choice<T>(list: List<T>): Option<T>

Permutes list in place using Fisher-Yates swaps and unbiased bounded indices.

public fun shuffle<T>(list: List<T>): void