axax/esnext/__tests__/concurrentMap.test.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const concurrentMap_1 = require("../concurrentMap");
const of_1 = require("../of");
const range_1 = require("../range");
const toArray_1 = require("../toArray");
const wait_1 = require("../wait");
test("concurrentMap", async () => {
    const result = await toArray_1.toArray(concurrentMap_1.concurrentMap(async (value) => value * 2, 2)(of_1.of(1, 2, 3)));
    result.sort();
    expect(result).toEqual([2, 4, 6]);
});
test("concurrentMap async", async () => {
    let maxInParallel = 0;
    let currentInParallel = 0;
    const increment = () => {
        currentInParallel += 1;
        if (currentInParallel > maxInParallel) {
            maxInParallel = currentInParallel;
        }
    };
    const decrement = () => {
        currentInParallel -= 1;
    };
    for await (const item of concurrentMap_1.concurrentMap(async () => {
        increment();
        await wait_1.wait(100);
        decrement();
    }, 4)(range_1.range(1, 10))) {
        // noop
    }
    expect(maxInParallel).toEqual(4);
});