@lelantos-org/sdk / core / randomBelow

Function: randomBelow()

function randomBelow(n, bytes?): number;

Defined in: @lelantos-org/sdk/dist/core/random.d.ts:36

Uniform integer in [0, n).

Rejection-sampled rather than Math.floor(randomFloat01() * n): scaling a float spreads 2^56 outcomes over n buckets, which are equal in size only when n is a power of two. The bias is tiny at small n but it is a bias in a slot permutation, which is exactly the thing the permutation exists to remove.

bytes is injectable so a test can force a permutation; it must behave like randomBytes.

Parameters

Parameter	Type
n	number
bytes?	(k) => Uint8Array

Returns

number