将数组中的数字相加 [英] add up numbers in array

问题描述

我一直在关注这个 发布，但我无法让我的数组将数组中的所有数字相加.

I've been following this post but I cannot get my array to add up all numbers in my array.

我用这个:

 var array_new = [$(".rightcell.emphasize").text().split('€')];

给我这个数组:

array_new: ,102.80,192.60,22.16

然后我这样做:

var sum = array_new.reduce((a, b) => a + b, 0);
  console.log(sum); //gives me this 0,102.80,192.60,22.16

当我只想把数字加起来时，我得到了这个结果0,102.80,192.60,22.16.有人能给我建议吗?

When all I want to do is add up the numbers, I get this result 0,102.80,192.60,22.16. Can anyone advise me?

推荐答案

由于您的数组由 undefined 和一堆字符串组成，因此您必须解析这些值才能获得数字.答案是:

Since your array is composed of undefined and a bunch of strings you have to parse the values to get the numbers. The answer would be:

var data = [,'102.80','192.60','22.16'];

console.log(data.reduce((r,c) => r + parseFloat(c), 0))

但是，如果您不想处理该函数中的解析，您可以确保您的数组以数字数组的形式出现:

However if you do not want to deal with the parsing in that function you can make sure that your array comes out as array of numbers like this:

Array.from([$(".rightcell.emphasize").text().split('€')], (x) => parseFloat(x || 0))

这将使您的数组准备好求和，而无需在 Array.reduce 中解析.所以它会是这样的:

Which would get your array ready for summation and without the need to parse inside the Array.reduce. So it would be something like this:

var strings = [,'102.80','192.60','22.16'];
var numbers = Array.from(strings, (x) => parseFloat(x || 0))

console.log(numbers.reduce((r,c) => r + c, 0))

但在您的情况下，它会更短，因为您会将前两行作为第二行代码片段中的一行.

But in your case it would be shorter since you would do the first 2 lines as one as shown in the 2nd code snippet.

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