Question

我正在试图找出一个问题，我需要找到数组中所有数字的乘积。

对于我的生活，我无法弄清楚为什么这会一直未定义。

我很想知道为什么我的代码无效的任何建议。谢谢！

function mutliplyAllElements(arr) {

  arr.reduce(function(x, y) {
    return x * y;
  });
}

mutliplyAllElements([2, 3, 100]);  // 600

Answer 1

You are getting undefined because function mutliplyAllElements does not return anything. You have to return the value in the function.

function mutliplyAllElements(arr) {
  let val = arr.reduce(function(x, y) {
    return x * y;
  });
  return val;
}

console.log(mutliplyAllElements([2, 3, 100]));

Or you can make it shorter as:

function mutliplyAllElements(arr) {
  return arr.reduce((x, y) => x * y);
}

console.log( mutliplyAllElements([2, 3, 100]) );

Javascript reduce保持返回undefined

1 个答案: