@reactivex/ix-esnext-esm/asynciterable/operators/_grouping.js

The Interactive Extensions for JavaScript

/**
 * @ignore
 */
export async function createGrouping(source, keySelector, elementSelector) {
    const map = new Map();
    for await (const item of source) {
        const key = await keySelector(item);
        let grouping = map.get(key);
        if (!map.has(key)) {
            grouping = [];
            map.set(key, grouping);
        }
        const element = await elementSelector(item);
        grouping.push(element);
    }
    return map;
}

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