const handler = {
  get(target, prop, receiver) {
    if (prop in target) {
      return Reflect.get(target, prop, receiver) * 2;
    }
    return `${prop} not found`;
  },
  set(target, prop, value) {
    if (typeof value !== "number") {
      throw new TypeError("Only numbers allowed");
    }
    target[prop] = value + 10;
    return true;
  },
  has(target, prop) {
    return prop.startsWith("x") ? false : prop in target;
  },
};

const obj = new Proxy({ score: 5, xp: 100 }, handler);

obj.level = 3;
console.log(obj.score);
console.log(obj.level);
console.log("xp" in obj);
console.log("score" in obj);
console.log(obj.rank);

const curry = (fn) => {
  const arity = fn.length;
  return function curried(...args) {
    if (args.length >= arity) {
      return fn(...args);
    }
    return (...moreArgs) => curried(...args, ...moreArgs);
  };
};

const volume = (l, w, h) => l * w * h;
const curriedVolume = curry(volume);

const withLength5 = curriedVolume(5);
const withLength5Width3 = withLength5(3);

console.log(typeof withLength5);
console.log(typeof withLength5Width3);
console.log(withLength5Width3(2));
console.log(curriedVolume(4)(6)(2));

function checkTDZ() {
  console.log(typeof undeclaredVar);

  try {
    console.log(typeof letVar);
  } catch (e) {
    console.log(`Caught: ${e.constructor.name}`);
  }

  let letVar = "initialized";

  const result = (() => {
    let x = 10;
    return function () {
      let x = x + 5;
      return x;
    };
  })();

  try {
    console.log(result());
  } catch (e) {
    console.log(`Caught: ${e.constructor.name}`);
  }
}

checkTDZ();

const str = "  Hello, World!  ";

const result = str
  .trim()
  .split(", ")
  .map((word, i) => {
    return i === 0
      ? word.toUpperCase()
      : word.replace(/!$/, "").split("").reverse().join("") + "?";
  })
  .join(" | ");

const [first, ...rest] = result.split(" | ");
const final = `${first} | ${rest.join(" & ")}`;

console.log(final);

const p1 = new Promise((resolve) => {
  console.log("A");
  resolve("B");
});

const p2 = p1.then((val) => {
  console.log(val);
  return "C";
});

p2.then((val) => {
  console.log(val);
});

console.log("D");

const prefix = 'user';
const id = 42;
const role = 'admin';

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1);

const profile = {
  [`${prefix}_${id}`]: 'Marcus',
  [Symbol.iterator]: null,
  [`get${capitalize(role)}`]: () => 'full-access',
  [`${prefix}Count`]: 3,
};

const dynamicKey = `${prefix}_${id}`;

console.log(
  profile[dynamicKey],
  profile[`get${capitalize(role)}`](),
  profile[`${prefix}Count`] * id,
  Object.keys(profile).length
);

const values = [0.1 + 0.2, NaN, Infinity, -0, 42.6789];

const results = values.map((v, i) => {
  if (i === 0) return Number.isInteger(v) + " " + v.toFixed(1);
  if (i === 1) return Number.isFinite(v) + " " + Number.isNaN(v);
  if (i === 2) return Number.isFinite(v) + " " + isFinite(v);
  if (i === 3) return Object.is(v, -0) + " " + (v === 0);
  if (i === 4) return v.toPrecision(4) + " " + Math.trunc(v);
});

results.forEach(r => console.log(r));