HomeWork/js/14-js-async-await/js/main.js

//Светофор
const delay = ms => new Promise(ok => setTimeout(() => ok(ms), ms))

async function trafficLight(parent, greenDelay, yellowDelay, redDelay) {
    while (true) {
        colorChange(parent, "green", 2)
        await delay(greenDelay)
        colorChange(parent, "yellow", 1)
        await delay(yellowDelay)
        colorChange(parent, "red", 0)
        await delay(redDelay)
        colorChange(parent, "yellow", 1)
        await delay(yellowDelay)
    }
}

let colorChange = (parent, color, indexElem) => {
    for (let i = 0; i < parent.children.length; i++) {
        indexElem === i ? parent.children[indexElem].style.background = color : parent.children[i].style.background = "";
    }
}

let elemCreator = (parent, element, amount) => {
    for (let i = 0; i < amount; i++) {
        let e = document.createElement(element);
        parent.append(e)
    }
}

elemCreator(light, "div", 3)

trafficLight(light, 6000, 2500, 6000)

//domEventPromise
function domEventPromise(element, eventName) {
    return new Promise((resolve, reject) => {
        let f = (event) => {
            element.removeEventListener(eventName, f)
            resolve(event)
        }
        element.addEventListener(eventName, f)
    })
}

//PedestrianTrafficLight
async function PedestrianTrafficLight(parent, greenDelay, redDelay, redDelay2 = 1200) {
    while (true) {
        colorChange(parent, "green", 1)
        await delay(greenDelay)
        colorChange(parent, "red", 0)
        await Promise.race([delay(redDelay), domEventPromise(btn, 'click')]).then(async function () { await delay(redDelay2) }) //поставил задержку чтоб было не мгновенное переключение, а убыстренее)
    }
}

elemCreator(pedestrianLight, "div", 2);

PedestrianTrafficLight(pedestrianLight, 6000, 6000)
btn.addEventListener("click", changeButtonState)

async function changeButtonState() {
    btn.disabled = true;
    await delay(10000)
    btn.disabled = false;
}

//speedtest
async function speedtest(getPromise, count, parallel = 1) {

    let t0 = performance.now();
    for (let i = 0; i < count; i++) {
        let promises = [];

        for (let j = 0; j < parallel; j++) {
            let res = getPromise();
            promises.push(res);
        }
        await Promise.all(promises)
    }
    let t1 = performance.now();

    let duration = t1 - t0;
    let querySpeed = count / duration;
    let queryDuration = duration / count;
    let parallelSpeed = (count * parallel) / duration;
    let parallelDuration = duration / (count * parallel);

    return {
        duration,
        querySpeed, //средняя скорость одного запроса
        queryDuration, //
        parallelSpeed,
        parallelDuration
    }
}


speedtest(() => delay(1000), 10, 10).then(result => console.log(result))
// {duration: 10000, 
// querySpeed: 0.001, //1 тысячная запроса за миллисекунду
// queryDuration: 1000, //1000 миллисекунд на один реальный запрос в среднем 
// parallelSpeed: 0.01  // 100 запросов за 10000 миллисекунд
// parallelDuration: 100 // 100 запросов за 10000 миллисекунд
speedtest(() => fetch('http://swapi.dev/api/people/1').then(res => res.json()), 10, 5)