const WM = new WeakMap();
let obj = {};
let anotherObj = {};
WM.set(obj, 'object data');
WM.set(anotherObj, 'another object data');
obj = null;

// Let's check what's logged
console.log(WM.has(obj));
console.log(WM.has(anotherObj));

const mySet = new Set();
mySet.add(10);
mySet.add(20);
mySet.add(10);
mySet.add(30);

console.log(mySet.size);

function* customGenerator() {
    yield 'Hello';
    yield 'World';
    return 'Done';
}

const gen = customGenerator();
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);

const myObject = {
  a: 1,
  b: 2,
  c: 3,
  [Symbol.iterator]: function* () {
    for (let key of Object.keys(this)) {
      yield this[key];
    }
  }
};

const iter = myObject[Symbol.iterator]();
console.log(iter.next().value);
console.log(iter.next().value);
console.log(iter.next().value);

var obj = { a: 10, b: 20 };

with (obj) {
  var result = a + b;
}

console.log(result);

function trickyFunction() {
  let a = 5;
  let b = '5';
  let c = 5;

  if (a == b && b === c) {
    console.log('Condition 1');
  } else if (a === c || b == c) {
    console.log('Condition 2');
  } else {
    console.log('Condition 3');
  }
}

trickyFunction();

function displayArguments() {
  console.log(arguments.length);
  console.log(arguments[0]);
  console.log(arguments[2]);
}

displayArguments('Hello', 'World', 'JavaScript', 'Quiz');