编辑代码

//程序运行完成时一定要有输出语句，本工具才能正确展示运行结果。 
console.log("Hello JSRUN!   \n\n         - from NodeJS .");

let arr = [12, 34, 23];
let sum = arr.reduce((total, num) => total + num);

arr = [12, 34, 23];
sum = arr.reduce((total, num) => total + num, 10);  // 以10为初始值求和

var result = [
  { subject: 'math', score: 88 },
  { subject: 'chinese', score: 95 },
  { subject: 'english', score: 80 }
];
sum = result.reduce((accumulator, cur) => accumulator + cur.score, 0);
console.log(sum)

sum = result.reduce((accumulator, cur) => accumulator + cur.score, -10);  // 总分扣除10分
console.log(sum)