@bygdle/random-pool
v1.3.0
Published
Select random items from a pool of items
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random-pool
https://github.com/NiuWeb/random-pool
Picks random elements from a pool.
Usage
The basic usage of the library is the following:
import { RandomPool } from "@bygdle/random-pool"
const pool = new RandomPool({
values: [["A", 50], ["B", 25], ["C", 25]],
})
// A has 50% chance of being picked
// B and C have 25% chance of being picked
const picked = pool.pick()
The weights of the items does not have to add up to 100, the probability is computed based on the sum of the weights:
import { RandomPool } from "@bygdle/random-pool"
const pool = new RandomPool({
values: [["A", 100], ["B", 50], ["C", 50]],
})
// A has 50% chance of being picked
// B and C have 25% chance of being picked
const picked = pool.pick()
Dependent pools
You can configure the pool to remove items when they are picked, so it behaves like a dependent random variable:
import { RandomPool } from "@bygdle/random-pool"
const pool = new RandomPool({
values: [["A", 100], ["B", 50], ["C", 50]],
dependent: true
})
// At the first pick:
// A has 50% chance of being picked
// B and C have 25% chance of being picked
pool.pick()
// At the second pick:
// If A was picked at the first pick ->
// B and C have 50% chance of being picked
// If B or C were picked at the first pick ->
// A has 75% chance of being picked,
// and the other one has 25% chance of being picked
pool.pick()
// At the third pick:
// The only remaining item is picked
pool.pick()
// At the fourth pick:
// The pool is empty, and an error is thrown
pool.pick()