js求和数组

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

const items = [
  { name: 'item1', value: 10 },
  { name: 'item2', value: 20 },
  { name: 'item3', value: 30 }
];
const totalValue = items.reduce((total, item) => total + item.value, 0);
console.log(totalValue); // 输出: 60

const mixedArray = [1, 'a', 3, null, 5];
const safeSum = mixedArray.reduce((acc, val) => {
  return typeof val === 'number' ? acc + val : acc;
}, 0);
console.log(safeSum); // 输出: 9

const emptyArray = [];
const sumEmpty = emptyArray.length > 0 ? emptyArray.reduce((a, b) => a + b, 0) : '数组为空';
console.log(sumEmpty); // 输出: '数组为空'