@reactivex/ix-esnext-esm/iterable/operators/groupby.js

The Interactive Extensions for JavaScript

import { IterableX } from '../iterablex';
import { identity } from '../../util/identity';
import { createGrouping } from './_grouping';
export class GroupedIterable extends IterableX {
    constructor(key, source) {
        super();
        this.key = key;
        this._source = source;
    }
    [Symbol.iterator]() {
        return this._source[Symbol.iterator]();
    }
}
export class GroupByIterable extends IterableX {
    constructor(source, keySelector, elementSelector, resultSelector) {
        super();
        this._source = source;
        this._keySelector = keySelector;
        this._elementSelector = elementSelector;
        this._resultSelector = resultSelector;
    }
    *[Symbol.iterator]() {
        const map = createGrouping(this._source, this._keySelector, this._elementSelector);
        for (const [key, values] of map) {
            yield this._resultSelector(key, values);
        }
    }
}
export function groupByResultIdentity(key, values) {
    return new GroupedIterable(key, values);
}
export function groupBy(keySelector, elementSelector = identity, resultSelector = groupByResultIdentity) {
    return function groupByOperatorFunction(source) {
        return new GroupByIterable(source, keySelector, elementSelector, resultSelector);
    };
}

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