JavaScript

❓ CHALLENGE #211

const obj = {};
const sym1 = Symbol('a');
const sym2 = Symbol('b');

obj[sym1] = 1;
obj[sym2] = 2;

console.log(Object.keys(obj));

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❓ CHALLENGE #210

function deepFreeze(obj) {
  Object.freeze(obj);
  Object.getOwnPropertyNames(obj).forEach(prop => {
    if (typeof obj[prop] === 'object' && !Object.isFrozen(obj[prop])) {
      deepFreeze(obj[prop]);
    }
  });
  return obj;
}

const data = { a: { b: { c: 1 } } };
const frozenData = deepFreeze(data);

frozenData.a.b.c = 2;

console.log(frozenData.a.b.c);

❓ CHALLENGE #209

function* fibonacci() {
  let [prev, curr] = [0, 1];
  while (true) {
    [prev, curr] = [curr, prev + curr];
    yield curr;
  }
}

const fib = fibonacci();

console.log(fib.next().value);
console.log(fib.next().value);
console.log(fib.next().value);

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❓ CHALLENGE #208

const asyncFunction = async () => {
  const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));

  const result = await Promise.race([delay(100), delay(500)]);
  return result;
};

asyncFunction().then(value => console.log(value));

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❓ CHALLENGE #207

var a = 1
function output () {
    console.log(a)
    var a = 2
    console.log(a)
}
console.log(a)
output()
console.log(a)

🤔

❓ CHALLENGE #206

for (var i = 0; i < 3; i++) {
  const log = () => {
    console.log(i)
  }
  setTimeout(log, 100)
}

☠️

❓ CHALLENGE #205

function asyncFunction(value) {
  return new Promise(resolve => {
    setTimeout(() => {
      console.log(value);
      resolve(value);
    }, 1000);
  });
}

(async () => {
  const results = await Promise.all([asyncFunction(1), asyncFunction(2), asyncFunction(3)]);
  console.log(results);
})();