block6.js

// time.js
let loop = {
    time: Date.now(),
    timer_heap: [],
    enqueue: function(timer) {
        this.timer_heap.push(timer)
        this.timer_heap.sort((a, b) => a.ms - b.ms)
    },
    dequeue: function() {
        this.timer_heap.splice(0, 1);
    },
    min: function() {
        if (this.timer_heap.length != 0) {
            return this.timer_heap[0]
        }
        return null
    }
}

function uv_timer_stop() {
    loop.dequeue()
}

function uv_update_time () {
    loop.time = Date.now()
}
function uv_run_timers() {
    let timer
    for (;;) {
        timer = loop.min()
        if (timer == null)
            break;
        if (timer.ms > loop.time)
            break;
        uv_timer_stop()
        timer.cb()
    }
}

function uv_loop_alive() {
    return loop.timer_heap.length == 0 ? 0 : 1
}

function uv_run() {
    let r
    while (r != 0) {
        uv_update_time()
        uv_run_timers()
        r = uv_loop_alive()
    }
}

global.setTimeout = function setTimeout(cb, ms) {
    loop.enqueue({ cb, ms: ms + loop.time })
}

setTimeout(() => console.log('60ms Timeout'), 60)
setTimeout(() => console.log('0ms Timeout'), 0)
setTimeout(() => console.log('1ms Timeout'), 1)
setTimeout(() => console.log('400ms Timeout'), 400)
uv_run()