Returns the sum of two or more numbers/arrays.
Use Array.prototype.reduce() to add each value to an accumulator, initialized with a value of 0.
代码片段
const sum = (...arr) => [...arr].reduce((acc, val) => acc + val, 0);使用样例
sum(1, 2, 3, 4); // 10
sum(...[1, 2, 3, 4]); // 10