geninq/dist/functions/group-by.js

A JavaScript version of the Linq library for Generators

"use strict";
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
    var g = generator.apply(thisArg, _arguments || []), i, q = [];
    return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
    function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
    function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
    function fulfill(value) { resume("next", value); }
    function reject(value) { resume("throw", value); }
    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
Object.defineProperty(exports, "__esModule", { value: true });
const safe_type_1 = require("@paulpopat/safe-type");
const fake_hash_1 = require("../fake-hash");
const utils_1 = require("./utils");
function CreateBuilder(builder) {
    var _a;
    return (0, safe_type_1.IsFunction)(builder)
        ? {
            key: builder,
            element: (i) => i,
        }
        : {
            key: builder.key,
            element: (_a = builder.element) !== null && _a !== void 0 ? _a : ((i) => i),
        };
}
(0, utils_1.Build)("group_by", function* (builder, comparitor = (a, b) => a === b) {
    const internal = this.array();
    const b = CreateBuilder(builder);
    const hash = (0, fake_hash_1.FakeHash)(comparitor);
    for (const item of internal) {
        const key = b.key(item);
        if (hash.contains(key)) {
            continue;
        }
        hash.add(key);
        yield [
            key,
            (function* () {
                for (let i = 0; i < internal.length; i++) {
                    const item = internal[i];
                    const bkey = b.key(item);
                    if (comparitor(key, bkey)) {
                        yield b.element(item);
                    }
                }
            })(),
        ];
    }
}, function (builder, comparitor = (a, b) => a === b) {
    return __asyncGenerator(this, arguments, function* () {
        const internal = yield __await(this.array());
        const b = CreateBuilder(builder);
        const hash = (0, fake_hash_1.FakeHash)(comparitor);
        for (const item of internal) {
            const key = yield __await(Promise.resolve(b.key(item)));
            if (hash.contains(key)) {
                continue;
            }
            hash.add(key);
            yield yield __await([
                key,
                (function () {
                    return __asyncGenerator(this, arguments, function* () {
                        for (let i = 0; i < internal.length; i++) {
                            const item = internal[i];
                            const bkey = b.key(item);
                            if (comparitor(key, bkey)) {
                                yield yield __await(yield __await(Promise.resolve(b.element(item))));
                            }
                        }
                    });
                })(),
            ]);
        }
    });
});