Сергей Соколов

function test(a, b, funcName) {
  let c = a+b;
  if (typeof this[funcName] === "function") this[funcName]();
  else throw `No such function ${funcName}`;
  return c;
}

function multiplication() {
  console.log("multiplication!");
}

test(2, 3, 'multiplication'); // выведет multiplication!
test(6, 4, 'division'); // выкинет ошибку, бо нет такой функции

// замените
var bal = $.trim($('#bal').val());
// на
var bal = +$.trim($('#bal').val());

var cl1 = $.ajax({
                    url: "ajaxs.php",
                    data: "x=test",
                    type: "POST",
                    success: function (data) {
                        window.test1 = data;
                    }
                });
                var cl = test1;

1. загружается страница;
   
2. смотрим, есть ли сохранённые в LS лайки – если есть показываем их;
   
3. при каждом обновлении счётчика лайков, записываем в LS.
   

const KEY = 'my-likes';
let likes = 0; // по умолчанию
if (localStorage.hasOwnProperty(KEY)) likes = +localStorage.getItem(KEY);
const showLikes = n => document.querySelector("#root").innerText = n;
showLikes(likes);
let plusOne = () => {
  likes++;
  localStorage.setItem(KEY, likes);  
  showLikes(likes);
}

const hpDelta = chance => 10 + (chance > 5 ? 10 : 0) + (chance > 7 ? 20 : 0);

const simpleFight = () => {
    let player_hp = 100;
    let enemy_hp = 100;
    let player_chance;
    let enemy_chance;

    const hpDelta = chance => 10 + (chance > 5 ? 10 : 0) + (chance > 7 ? 20 : 0);
    const randomChance = () => Math.floor(Math.random() * 11);
    const healthReport = hello => console.log(`${hello||''} Your health: ${player_hp}%, enemy health: ${enemy_hp}%`);
    const chanceReport = hello => console.log(`${hello||''} Your chance: ${player_chance}, enemy chance: ${enemy_chance}`);

    healthReport("Welcome!");

    while (player_hp || enemy_hp > 0) {
        player_chance = randomChance();
        enemy_chance = randomChance();
        chanceReport();
        if (player_chance > enemy_chance) {
            enemy_hp -= hpDelta(player_chance);
            console.log(`Your turn. Enemy health updated to: ${enemy_hp}%`);
        } else if (enemy_chance > player_chance) {
            player_hp = hpDelta(enemy_chance);
            console.log(`Enemy's turn. Your health updated to: ${player_hp}%`);
        } else {
            chanceReport('Equal chances!');
        }

        if (enemy_hp <= 0) {
            healthReport('You win!');
            break;
        } else if (player_hp <= 0) {
            healthReport('You lost!');
            break;
        }
    }
}


simpleFight();

function addFilter(filter) {
  const delimiter = ',';

  // разобрать хэш
  const str = location.hash;
  const hashes = str.slice(str.indexOf('#') + 1).split('&')
  const params = {}
  hashes.forEach(hash => {
    if (!hash) return;
    const [key, val] = hash.split('=')
    params[key] = decodeURIComponent(val)
  })

  // параметр фильтров разобрать, добавить, собрать
  const filters = params.search ? params.search.split(delimiter) : [];
  filters.push(filter); // ["Toster", "Habr"]
  params.search = filters.join(delimiter);

  // собрать обратно
  hashes.length = 0;
  for (p in params) 
    hashes.push([p, encodeURIComponent(params[p])].join('='));
  
  location.hash = '#' + hashes.join('&');
}

addFilter('Toster');
addFilter('Habr');
//#search=Toster%2CHabr

const value = 1 + 1 * 1;
var a = {
  b: value,
  b1: value
}

// хочется так? (но нельзя!)
var a = {
  b: 1,
  c: this.b * 10
}

// тогда можно так:
var a = {
  get c() { return this.b * 10; }
}
a.b = 1;

a.c // 10

const dates = [];
const options = { year: 'numeric', month: '2-digit', day: '2-digit' };
const d = new Date();
d.setMonth(0);
d.setDate(1);
const year = d.getFullYear();
while(d.getFullYear() === year) {
  dates.push(d.toLocaleDateString('en-US', options));
  d.setDate(d.getDate() + 1);
}

/*
01/01/2019
01/02/2019
01/03/2019
01/04/2019
01/05/2019
01/06/2019
01/07/2019
01/08/2019
01/09/2019
01/10/2019
...
*/

while (start < end) {
    array[start++] = value;
}