function processData() {
  try {
    console.log('start');
    throw new Error('oops');
    console.log('after throw');
  } catch (e) {
    console.log('catch');
    return 'caught';
  } finally {
    console.log('finally');
  }
  console.log('end');
}

const result = processData();
console.log(result);

function highlight(strings, ...values) {
  return strings.reduce((result, string, i) => {
    const value = values[i] ? `<mark>${values[i]}</mark>` : '';
    return result + string + value;
  }, '');
}

const name = 'Sarah';
const age = 25;
const template = highlight`Hello ${name}, you are ${age} years old!`;
console.log(template);

const empty = highlight`No interpolation here`;
console.log(empty);

class EventManager {
  constructor() {
    this.listeners = new Map();
  }
  
  addListener(event, callback) {
    if (!this.listeners.has(event)) {
      this.listeners.set(event, new Set());
    }
    this.listeners.get(event).add(callback);
  }
  
  removeListener(event, callback) {
    this.listeners.get(event)?.delete(callback);
  }
}

const manager = new EventManager();
const handler = () => console.log('handled');
manager.addListener('click', handler);
manager.removeListener('click', () => console.log('handled'));
console.log(manager.listeners.get('click').size);

const data = { a: 1, b: 2, c: 3 };
const { a, ...rest } = data;
const newObj = { ...rest, a, d: 4 };

const arr = [1, 2, 3, 4, 5];
const [first, , third, ...remaining] = arr;
const result = [...remaining, third, first];

console.log(newObj);
console.log(result);

console.log('1');

setTimeout(() => console.log('2'), 0);

Promise.resolve().then(() => console.log('3'));

queueMicrotask(() => console.log('4'));

setTimeout(() => console.log('5'), 0);

Promise.resolve().then(() => {
  console.log('6');
  return Promise.resolve();
}).then(() => console.log('7'));

console.log('8');

class CustomError extends Error {
  constructor(message) {
    super(message);
    this.name = 'CustomError';
  }
}

try {
  try {
    throw new CustomError('inner error');
  } catch (e) {
    console.log(e.name);
    throw new Error('outer error');
  }
} catch (e) {
  console.log(e.message);
  console.log(e instanceof CustomError);
}

const original = {
  name: 'Sarah',
  scores: [85, 92, 78],
  details: {
    age: 25,
    city: 'Portland'
  }
};

const copy1 = { ...original };
const copy2 = JSON.parse(JSON.stringify(original));

copy1.name = 'Emma';
copy1.scores.push(95);
copy1.details.age = 30;

console.log(original.name, original.scores.length, original.details.age);