@typed/test/lib.es2015/common/collectByKey.js

Testing made simple.

export function collectByKey(f, list) {
    const record = {};
    for (const item of list) {
        const key = f(item);
        if (!record[key]) {
            record[key] = [];
        }
        record[key].push(item);
    }
    return record;
}
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