@johngw/stream/dist/transformers/groupBy.js

Reactive programming tools using the WHATWG Streams API.

import { accumulate } from './accumulate.js';
export function groupBy(propNameOrFn) {
    const getKey = typeof propNameOrFn === 'function'
        ? propNameOrFn
        : (chunk) => chunk[propNameOrFn].toString();
    return accumulate({}, (acc, chunk) => {
        const key = getKey(chunk);
        return { ...acc, [key]: key in acc ? [...acc[key], chunk] : [chunk] };
    });
}
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