ts-prime/dist/es/groupBy.js

A utility library for JavaScript and Typescript.

import { purry } from './purry';
export function groupBy() {
    return purry(_groupBy(false), arguments);
}
function isArray(data) {
    return Array.isArray(data);
}
var _groupBy = function (indexed) { return function (array, fn) {
    var ret = {};
    array.forEach(function (item, index) {
        var value = indexed ? fn(item, index, array) : fn(item);
        var addToGroup = function (key, value) {
            if (!ret[key]) {
                ret[key] = [];
            }
            ret[key].push(value);
        };
        if (isArray(value)) {
            value.forEach(function (key) {
                addToGroup(key, item);
            });
            return;
        }
        addToGroup(value, item);
    });
    return ret;
}; };
(function (groupBy) {
    function indexed() {
        return purry(_groupBy(true), arguments);
    }
    groupBy.indexed = indexed;
})(groupBy || (groupBy = {}));