json-schema-describes-subset/dist/utils/group-by-and-map/group-by-and-map.js

Tools for static JSON schema analysis, including functions to determine if one schema describes a subset of another or if a schema describes the empty set or to convert a schema to its disjunctive normal form (DNF).

export function groupByAndMap(array, getKey, map) {
    const result = {};
    for (const value of array) {
        const key = getKey(value);
        const mappedValue = map(value);
        const arrayForKey = result[key];
        if (arrayForKey === undefined) {
            result[key] = [mappedValue];
        }
        else {
            arrayForKey.push(mappedValue);
        }
    }
    return result;
}
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