JavaScript

❓ CHALLENGE

function factorial(n) {
  return n <= 1 ? 1 : n * factorial(n - 1);
}
console.log(factorial(5));

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❓ CHALLENGE

function* generateSequence() {
  yield 1;
  yield 2;
  return 3;
}

const generator = generateSequence();
console.log(generator.next());
console.log(generator.next());
console.log(generator.next());

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❓ CHALLENGE

const num = 8;
const obj = {
  num: 10,
  inner: {
    num: 6,
    getNum: function() {
      return this.num;
    }
  }
};
console.log(obj.inner.getNum());
const getNum = obj.inner.getNum;
console.log(getNum());

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❓ CHALLENGE

const nums = [1, 2, 3, 4, 5];
const sum = nums.reduce((total, current) => {
  return total + current * current;
}, 0);
console.log(sum);

❓ CHALLENGE

const value = { number: 10 };
function increment(obj) {
  obj.number++;
}
increment(value);
console.log(value.number);

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❓ CHALLENGE

const numbers = [1, 2, 3];
const [x, y, z] = numbers;
console.log(x, y, z);

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✌️📒 Eloquent JavaScript Goes Fourth Coming several years after the third edition, the latest version of, perhaps, the best ‘all rounder’ book for learning JavaScript is here: “adjusted to the realities of 2024 and generally touched up.” You can read it on the Web, but it’ll be available in print later on too. MARIJN HAVERBEKE