sequency/lib/groupBy.js

Functional sequences for processing iterable data in JavaScript

Object.defineProperty(exports, "__esModule", { value: true });
exports.GroupBy = void 0;
var GroupBy = /** @class */ (function () {
    function GroupBy() {
    }
    /**
     * Groups all elements of the sequence into a map. Keys are determined by the given `keySelector` function.
     *
     * @param {(value: T) => K} keySelector
     * @returns {Map<K, Array<T>>}
     */
    GroupBy.prototype.groupBy = function (keySelector) {
        var result = new Map();
        for (var item = this.iterator.next(); !item.done; item = this.iterator.next()) {
            var key = keySelector(item.value);
            var array = result.get(key);
            if (array == null) {
                result.set(key, [item.value]);
            }
            else {
                array.push(item.value);
            }
        }
        return result;
    };
    return GroupBy;
}());
exports.GroupBy = GroupBy;
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