Алексей Ярков

var changeTitle = function() {
    this.title = function () {
        var title = document.title;
        document.title = (title == "hello" ? "" : "hello");
    }
};

changeTitle.prototype.start = function() {
    this.timer = setInterval(this.title, 1000);
};

changeTitle.prototype.stop = function() {
    clearInterval(this.timer)
};

var timerTitle = new changeTitle();
window.onblur = function() {
    timerTitle.start();
};
window.onfocus = function() {
    timerTitle.stop();
};

var today = new Date();
console.log(today.getUTCHours() + 3 + ":" + today.getUTCMinutes() + ":" + today.getUTCSeconds());

И правильно ли я вообще делаю?

from concurrent.futures import ThreadPoolExecutor
from requests import Session

session = Session()

urls = [
    'https://toster.ru/q/372757',
    'https://toster.ru/',
]

with ThreadPoolExecutor(7) as pool:  # 7 - количество тредов
    for response in pool.map(session.get, urls):
        do_something_with_response(response)

def cmp(x):
    x = x.split('x')
    return int(x[0]) * int(x[1])

sorted(SIZES, key=cmp)

SIZES = ('1920x1080', '1600x1200', '1400x1050', '1280x1024', '1280x960', '1152x864', '1024x768',
             '3840x2400', '3840x2160', '3840x1200', '2560x1600', '2560x1440', '2560x1080', '2560x1024',
             '2048x1152', '1920x1200', '1680x1050', '1600x900', '1440x900', '1280x800', '1280x720', '2160x3840',
             '1440x2560', '1366x768', '1080x1920', '1024x600', '960x544', '800x1280', '800x600', '720x1280',
             '540x960', '480x854', '480x800', '400x480', '360x640', '320x480', '320x240', '240x400', '240x320',
             '2732x2732', '2048x2048', '1024x1024', '750x1334', '640x1136', '640x960', '1280x900')

dct = {int(size.split('x')[0]): size for size in SIZES}
dct_sorted = sorted(dct.items())

for size in dct_sorted:
    print(size[1])

Сколько можно использовать ключевых слов в meta-теге keywords?

Array.prototype.asyncEach = function (each, done) {
  var i = -1, a = this
  function iter() {
    if (++i === a.length) { done && done(); return }
    each.call(a, a[i], iter)
  }
  iter()
}

// Example
(new Array(10)).asyncEach(function (item, next) {
 setTimeout(function () {
   console.log("tick")
   next()
  }, 1000)
})