@walts81/linq-ts/lib/group-by.js

Typescript/Javascript LINQ implementation library

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.groupBy = void 0;
const get_value_as_string_1 = require("./get-value-as-string");
Array.prototype.groupBy = groupBy;
function groupBy(expression) {
    return this.reduce((prev, current, i) => {
        const tempKey = expression(current, i);
        const key = (0, get_value_as_string_1.getValueAsString)(tempKey);
        if (!prev.groups[key]) {
            const group = { key: tempKey, items: [] };
            prev.groups[key] = group;
            prev.results.push(group);
        }
        prev.groups[key].items.push(current);
        return prev;
    }, { groups: {}, results: [] }).results;
}
exports.groupBy = groupBy;