function* infiniteGenerator() {
  let i = 0;
  while (true) {
    yield i++;
  }
}

const weakMap = new WeakMap();
const gen = infiniteGenerator();

weakMap.set(gen, gen.next().value);

const result = weakMap.get(gen) + gen.next().value;

console.log(result);

console.log(MyClass);
class MyClass {
  constructor() {
    this.value = 42;
  }
}

function sumEvenIndices(arr) {
    return arr.reduce((sum, num, index) => {
        return index % 2 === 0 ? sum + num : sum;
    }, 0);
}


const numbers = [10, 20, 30, 40, 50];
const result = sumEvenIndices(numbers);
console.log(result);