@prelude/array/mjs/groups.js

Array module.

/** @returns values grouped by key (result of `keyOfValue`). */
const groups = (values, keyOfValue) => {
    const groups_ = new Map();
    for (const value of values) {
        const key = keyOfValue(value);
        const group = groups_.get(key);
        if (group) {
            group.push(value);
        }
        else {
            groups_.set(key, [value]);
        }
    }
    return Array.from(groups_.values());
};
export default groups;
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