将pickBy和mapValues从lodash转换为function

function pickBy(obj, predicate) {
  const result = {};
  for (const key in obj) {
    if (predicate(obj[key], key)) {
      result[key] = obj[key];
    }
  }
  return result;
}

const obj = { a: 1, b: 2, c: 3 };
const picked = pickBy(obj, (value, key) => value > 1);
console.log(picked); // { b: 2, c: 3 }

function mapValues(obj, transform) {
  const result = {};
  for (const key in obj) {
    result[key] = transform(obj[key], key);
  }
  return result;
}

const obj = { a: 1, b: 2, c: 3 };
const transformed = mapValues(obj, (value, key) => value * 2);
console.log(transformed); // { a: 2, b: 4, c: 6 }