[ES6] notes

function setUser(name, {superuser = false, expires = "2025"} = {}) {

  if (superuser) {
    console.log(name + " is superuser!")
  }
}

setUser("tom")
setUser("wojt", {superuser: true, expires: "2026"})


let name = Symbol("name");
let person = {};

person[name] = "du8a";

console.log(person[name]);

let homies = new Set([7,8,9]);
homies.add(1);
homies.add(2);

console.log(homies.has(1));

let numbers = [...homies]

console.log(numbers);

function removeDuplicates(arr) {
  return [...(new Set(arr))]
}
console.log(removeDuplicates([1,1,2,2,3]))

let player = new Map();
player.set("name", "fiux");
player.set("frags", 69);

console.log(player.get("name"));
console.log(player.get("frags"));

let players = new Map([["as", 4], ["bee", 7]]);

console.log(players);


function* createIterator() {
  yield 1;
  yield 2;
  yield 3;
}

let iterator = createIterator();
console.log(iterator.next().value);
console.log(iterator.next().value);
console.log(iterator.next().value);


let values = [1,2,3,4];
for (let num of values) {
  console.log(num);
}

for(let homie of homies) {
  console.log("homie" + homie);
}

let methodName = "sayName";

class Person {
  constructor(name) {
    this.name = name;
  }

  [methodName]() {
    console.log(this.name)
  }
}

let ela = new Person("ela");

ela.sayName();

function toPower(){
 return Array.from(arguments, (val)=>{
    return val *val
  })
}

console.log(toPower(2,3,4,5));

console.log(values.find(val => val%2 == 0))
console.log(values.findIndex(val => val>3))

console.log([1,2,3,4,5,6,7].copyWithin(1,3))



function getRandomEvenNum() {
  return new Promise(function(resolve, reject) {
   let randNum = Math.floor(Math.random()*90);

    setTimeout(()=>{
      if (randNum % 2){
        reject("nieparzysta liczba kurwiu")
      } else {
        resolve(`twoja parzysta liczba to ${randNum}`)
      }
    }, 1500);
  });
}


let myPromise = getRandomEvenNum();

myPromise.then(contents => {
  console.log(contents)
}, err =>{
 console.log(err)
})

let target = {
  name: "tom",
  value: 43
}

var proxy = new Proxy(target, {
  has(trapTarget, key) {
    if(key==="value") {
        return false
    } else {
      return Reflect.has(trapTarget, key)
    }
  }
})

console.log("value" in proxy);
console.log("name" in proxy);
console.log("toString" in proxy);

var proxy = new Proxy({}, {
  defineProperty(trapTarget, key, descriptor){
    if (typeof key === "symbol") {
      return false;
    }
    return Reflect.defineProperty(trapTarget,key, descriptot);
  }


})

console.log(3 ** 3);