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allow creating RandomPicker from iterable and separately specified length

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Hervé BECHER
2024-05-09 16:28:05 +02:00
parent b48f97d1c3
commit a1f43287a0
1 changed files with 5 additions and 4 deletions
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9
src/random.ts
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@@ -91,20 +91,21 @@ export class RandomPicker<T> {
readonly #flags: BitArray; readonly #flags: BitArray;
readonly #options: Required<RandomOptions<T>>; readonly #options: Required<RandomOptions<T>>;
public constructor(elements: T[], options?: RandomOptions<T>) { public constructor(elements: Iterable<T>, length: number, options?: RandomOptions<T>) {
this.#elements = elements; this.#elements = elements;
this.#flags = BitArray.create(elements.length); this.#flags = BitArray.create(length);
this.#options = withDefaultOptions(mergeOptions({ predicate: i => this.#flags.get(i) }, options)); this.#options = withDefaultOptions(mergeOptions({ predicate: i => this.#flags.get(i) }, options));
this.reset(); this.reset();
} }
public static from<T>(iterable: Iterable<T>, options?: RandomOptions<T>) { public static from<T>(iterable: Iterable<T>, options?: RandomOptions<T>) {
return new this<T>(asArray(iterable), options); const arr = asArray(iterable);
return new this<T>(arr, arr.length, options);
} }
public static of<T>(options?: RandomOptions<T>, ...values: T[]) { public static of<T>(options?: RandomOptions<T>, ...values: T[]) {
return new this<T>(values, options); return new this<T>(values, values.length, options);
} }
public get state() { public get state() {