使用Powershell，我如何计算数组中每个元素的出现? [英] Using Powershell, how can i count the occurrence of each element in an array?

问题描述

如果我有一个数组:

1 1 1 2 2 3 4 4 4 4 5 5

1 1 1 2 2 3 4 4 4 4 5 5

如何使用Powershell告诉我该数组中每个元素有多少个?

How can I use Powershell to tell me how many of each element there are in that array?

更清楚一点，我应该为每个数组元素分别计数:

To be a little more clear, I should have a separate count for each array element:

元素:计数

1:3

2:2

3:1

4:4

5:2

推荐答案

您可以使用Group-Object cmdlet:

You can use the Group-Object cmdlet:

PS> 1,1,1,2,2,3,4,4,4,4,5,5 | group

Count Name                      Group
----- ----                      -----
    3 1                         {1, 1, 1}
    2 2                         {2, 2}
    1 3                         {3}
    4 4                         {4, 4, 4, 4}
    2 5                         {5, 5}

如果您想要项的哈希表及其数量，您只需要在其后加上一点ForEach-Object:

If you want a hashtable for the items and their counts you just need a little ForEach-Object after it:

$array | group | % { $h = @{} } { $h[$_.Name] = $_.Count } { $h }

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