Question

我有一个总数组，里面有其他值数组。我希望借助forEach和reduce（）添加嵌套值

// My main array
Total = [
  [ 1, 0, 1, 0 ],
  [ 0, 1, 0, 0 ],
  [ 1, 0, 0, 1 ],
  [ 0, 0, 1, 0 ],
  [ 0, 1, 0, 0 ],
  [ 1, 0, 0, 0 ],
  [ 0, 0, 0, 0 ],
  [ 0, 0, 0, 0 ] ]

// The code I have

  Total.forEach(function(element) {
    element.reduce(function(a,b) {
        console.log(a+b)
    }, 0)
})

// Output not as expected!
    1
NaNNaNNaN0 NaNNaNNaN1 NaNNaNNaN0 NaNNaNNaN0 NaNNaNNaN1 []

例如，我想要的是，第一个forEach应该给出1+0+1+0 = 2...的总和，依此类推

Answer 1

使用map嵌套的reduce尝试这种方法：

const Total = [
    [1, 0, 1, 0],
    [0, 1, 0, 0],
    [1, 0, 0, 1],
    [0, 0, 1, 0],
    [0, 1, 0, 0],
    [1, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 0, 0]
];

let res = Total.map(x => x.reduce((res, curr) => res += curr, 0));
console.log(res);

Answer 2

您可以尝试此代码

var Total = [
  [ 1, 0, 1, 0 ],
  [ 0, 1, 0, 0 ],
  [ 1, 0, 0, 1 ],
  [ 0, 0, 1, 0 ],
  [ 0, 1, 0, 0 ],
  [ 1, 0, 0, 0 ],
  [ 0, 0, 0, 0 ],
  [ 0, 0, 0, 0 ] ];

  function myFunction(){
    for(let i=0 ;i<Total.length;i++){

    console.log(Total[i].reduce(getSum));

    }
  }

  function getSum(total, num) {
  return total + num;
}
myFunction();

希望这会有所帮助

请我希望在我的JavaScript数组数组上使用reduce方法

2 个答案: