sequence-js/src/collector/v2/impl.ts

// import { Converter } from "../../types.js";
// import { CollectorFactory, CollectorInstance } from "./types.js";

// export class ToArrayCollectorFactory<TElement> implements CollectorFactory<TElement, TElement[]> {
//   initialize() {
//     return new ToArrayCollectorInstance<TElement>();
//   }
// };

// class ToArrayCollectorInstance<TElement> implements CollectorInstance<TElement, TElement[]> {
//   readonly #accumulator: TElement[];

//   constructor() {
//     this.#accumulator = [];
//   }

//   accumulate(element: TElement) {
//     this.#accumulator.push(element);
//   }

//   finalize() {
//     return this.#accumulator;
//   }
// }

// export class ToObjectCollectorFactory<TElement, TKey extends PropertyKey, TValue> implements CollectorFactory<TElement, Record<TKey, TValue>> {
//   readonly #keySelector: Converter<TElement, TKey>;
//   readonly #valueSelector: Converter<TElement, TValue>;

//   constructor(keySelector: Converter<TElement, TKey>, valueSelector: Converter<TElement, TValue>) {
//     this.#keySelector = keySelector;
//     this.#valueSelector = valueSelector;
//   }

//   get keySelector() {
//     return this.#keySelector;
//   }

//   get valueSelector() {
//     return this.#valueSelector;
//   }

//   initialize() {
//     return new ToObjectCollectorInstance<TElement, TKey, TValue>(this);
//   }
// }

// class ToObjectCollectorInstance<TElement, TKey extends PropertyKey, TValue> implements CollectorInstance<TElement, Record<TKey, TValue>> {
//   readonly #factory: ToObjectCollectorFactory<TElement, TKey, TValue>;
//   readonly #accumulator = <Record<TKey, TValue>>{};

//   constructor(factory: ToObjectCollectorFactory<TElement, TKey, TValue>) {
//     this.#factory = factory;
//   }

//   accumulate(element: TElement) {
//     const key = this.#factory.keySelector(element);
//     const value = this.#factory.valueSelector(element);

//     this.#accumulator[key] = value;
//   }

//   finalize() {
//     return this.#accumulator;
//   }
// }

// export class ToMapCollectorFactory<TElement, TKey extends PropertyKey, TValue> implements CollectorFactory<TElement, Map<TKey, TValue>> {
//   readonly #keySelector: Converter<TElement, TKey>;
//   readonly #valueSelector: Converter<TElement, TValue>;

//   constructor(keySelector: Converter<TElement, TKey>, valueSelector: Converter<TElement, TValue>) {
//     this.#keySelector = keySelector;
//     this.#valueSelector = valueSelector;
//   }

//   get keySelector() {
//     return this.#keySelector;
//   }

//   get valueSelector() {
//     return this.#valueSelector;
//   }

//   initialize() {
//     return new ToMapCollectorInstance<TElement, TKey, TValue>(this);
//   }
// }

// class ToMapCollectorInstance<TElement, TKey extends PropertyKey, TValue> implements CollectorInstance<TElement, Map<TKey, TValue>> {
//   readonly #factory: ToMapCollectorFactory<TElement, TKey, TValue>;
//   readonly #accumulator = new Map<TKey, TValue>();

//   constructor(factory: ToMapCollectorFactory<TElement, TKey, TValue>) {
//     this.#factory = factory;
//   }

//   accumulate(element: TElement) {
//     const key = this.#factory.keySelector(element);
//     const value = this.#factory.valueSelector(element);

//     this.#accumulator.set(key, value);
//   }

//   finalize() {
//     return this.#accumulator;
//   }
// }

// export class ToSetCollectorFactory<TElement> implements CollectorFactory<TElement, Set<TElement>> {
//   initialize() {
//     return new ToSetCollectorInstance<TElement>();
//   }
// }

// class ToSetCollectorInstance<TElement> implements CollectorInstance<TElement, Set<TElement>> {
//   readonly #accumulator = new Set<TElement>();

//   accumulate(element: TElement) {
//     this.#accumulator.add(element);
//   }

//   finalize() {
//     return this.#accumulator;
//   }
// }

// export class JoinCollectorFactory implements CollectorFactory<any, string> {
//   readonly #delimiter: string;
//   readonly #prefix: string;
//   readonly #suffix: string;

//   constructor(delimiter?: string, prefix?: string, suffix?: string) {
//     this.#delimiter = delimiter ?? "";
//     this.#prefix = prefix ?? "";
//     this.#suffix = suffix ?? "";
//   }

//   accumulate(element: string) {
//     this.#accumulator.push(element);
//   }

//   finalize() {
//     return this.#prefix + this.#accumulator.join(this.#delimiter) + this.#suffix;
//   }
// }

// class JoinCollectorInstance implements CollectorInstance<any, string> {
//   readonly #delimiter: string;
//   readonly #prefix: string;
//   readonly #suffix: string;
//   readonly #accumulator: any[] = [];

//   constructor(delimiter: string, prefix: string, suffix: string) {
//     this.#delimiter = delimiter ?? "";
//     this.#prefix = prefix ?? "";
//     this.#suffix = suffix ?? "";
//   }

//   accumulate(element: string) {
//     this.#accumulator.push(element);
//   }

//   finalize() {
//     return this.#prefix + this.#accumulator.join(this.#delimiter) + this.#suffix;
//   }
// }

// export class SumCollectorInstance implements CollectorInstance<number, number> {
//   #accumulator = 0;

//   accumulate(element: number) {
//     this.#accumulator += element;
//   }

//   finalize() {
//     return this.#accumulator;
//   }
// }

// export class BigIntSumCollectorInstance implements CollectorInstance<bigint, bigint> {
//   #accumulator = 0n;

//   accumulate(element: bigint) {
//     this.#accumulator += element;
//   }

//   finalize() {
//     return this.#accumulator;
//   }
// }

// export class AverageCollectorInstance implements CollectorInstance<number, number> {
//   #count = 0;
//   #sum = 0;

//   accumulate(element: number) {
//     this.#count++;
//     this.#sum += element;
//   }

//   finalize() {
//     return this.#count === 0 ? 0 : this.#sum / this.#count;
//   }
// }

// export class BigIntAverageCollectorInstance implements CollectorInstance<bigint, bigint> {
//   #count = 0n;
//   #sum = 0n;

//   accumulate(element: bigint) {
//     this.#count++;
//     this.#sum += element;
//   }

//   finalize() {
//     return this.#count === 0n ? 0n : this.#sum / this.#count;
//   }
// }