如何在对象中动态查找键值？

const obj = { a: 1, b: 2, c: 3 };
const keyToFind = 'b';

if (keyToFind in obj) {
  console.log(`Key found: ${keyToFind}, Value: ${obj[keyToFind]}`);
} else {
  console.log(`Key not found: ${keyToFind}`);
}

const obj = { a: 1, b: 2, c: 3 };
const keyToFind = 'b';

if (obj.hasOwnProperty(keyToFind)) {
  console.log(`Key found: ${keyToFind}, Value: ${obj[keyToFind]}`);
} else {
  console.log(`Key not found: ${keyToFind}`);
}

const obj = { a: 1, b: 2, c: 3 };
const keyToFind = 'b';

if (Object.keys(obj).includes(keyToFind)) {
  console.log(`Key found: ${keyToFind}, Value: ${obj[keyToFind]}`);
} else {
  console.log(`Key not found: ${keyToFind}`);
}

const obj = { a: 1, b: 2, c: 3 };
const keyToFind = 'b';

const foundEntry = Object.entries(obj).find(([key, value]) => key === keyToFind);

if (foundEntry) {
  console.log(`Key found: ${foundEntry[0]}, Value: ${foundEntry[1]}`);
} else {
  console.log(`Key not found: ${keyToFind}`);
}

const map = new Map([['a', 1], ['b', 2], ['c', 3]]);
const keyToFind = 'b';

if (map.has(keyToFind)) {
  console.log(`Key found: ${keyToFind}, Value: ${map.get(keyToFind)}`);
} else {
  console.log(`Key not found: ${keyToFind}`);
}