Homeworks_Oleksii.L/Homework_21/Clousers.js

// Замыкания
// makeProfileTimer---------------------------------------------------------------------------------------------------------------------;
function makeProfileTimer() {
  t1 = performance.now();
  confirm("Are you sure?");
  t2 = performance.now();
  return alert(
    "Call to confirm function took" + " " + (t2 - t1) + " " + "milliseconds"
  );
}

var timer = makeProfileTimer();

alert(timer());

// makeSaver----------------------------------------------------------------------------------------------------------------------------;

function makeSaver(callable) {
  let res,
    executed = !1;
  return function () {
    return executed ? res : ((executed = !0), (res = callable()));
  };
}
var saver = makeSaver(Math.random);
value1 = saver();
value2 = saver();
console.log(value1 === value2);

var saver2 = makeSaver(
  () =>
    console.log("saved function called") ||
    [null, undefined, false, "", 0, Math.random()][Math.ceil(Math.random() * 6)]
);
var value3 = saver2();
var value4 = saver2();

value3 === value4;

let namePrompt = prompt.bind(window, "Как тебя зовут?");
let nameSaver = makeSaver(namePrompt);
alert(`Привет! Prompt еще не было!`);
alert(
  `Привет ${nameSaver()}. Только что запустился prompt, первый и последний раз`
);
alert(`Слушай, ${nameSaver()}, го пить пиво. Ведь prompt был только один раз`);

// Final Countdown----------------------------------------------------------------------------------------------------------------------;

const messages = [5, 4, 3, 2, 1, "Go"];

for (let i = 0; i < messages.length; i++) {
  setTimeout(function () {
    console.log(messages[i]);
  }, 1000 * i);
}

// myBind-------------------------------------------------------------------------------------------------------------------------------;

function myBind(func, context, bindArgs) {
  function wrapper() {
    var args = Object.assign(bindArgs, arguments);
    return func.apply(context, args);
  }

  return wrapper;
}

var pow5 = myBind(Math.pow, Math, [undefined, 5]);

var cube = myBind(Math.pow, Math, [undefined, 3]);

alert(pow5(2));

alert(cube(3));

var zeroPrompt = myBind(prompt, window, [undefined, "0"]);

var someNumber = zeroPrompt("Введите число");

alert(someNumber);