js reduce 叠加

const numbers = [1, 2, 3, 4, 5];
const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
console.log(sum); // 输出: 15

const strings = ['Hello', ' ', 'World', '!'];
const sentence = strings.reduce((accumulator, currentValue) => accumulator + currentValue, '');
console.log(sentence); // 输出: "Hello World!"

const objects = [
  { a: 1, b: 2 },
  { b: 3, c: 4 }
];
const mergedObject = objects.reduce((accumulator, currentValue) => {
  return { ...accumulator, ...currentValue };
}, {});
console.log(mergedObject); // 输出: { a: 1, b: 3, c: 4 }

const numbers = [1, 2, 3, 4, 5];
const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 10);
console.log(sum); // 输出: 25