powershell 比较多个数组 [英] powershell comparing multiple arrays

问题描述

我有一个需要比较多个数组的情况.有一个主数组包含子数组的所有元素以及一些额外的元素.

I've a case where multiple arrays need to be compared.There is one master array that contains all the elements that the child arrays have and also some extra elements.

在下面的例子中，$a 是主数组，$b、$c 是子数组.我需要比较这些数组并获取 $a 中那些在 $b 和 $c 中不存在的额外元素的列表.实际上，就我而言，有 10 个子数组和一个主数组.

In below example, $a is the master array and $b, $c are child arrays. I need to compare these arrays and get the list of those extra elements in $a that are not present in $b and $c. Practically, in my case there are 10 child arrays and a master array.

$a="dhaw","roh","kohl","faf","abd","steyn","gupt","baz","kane","benn","brendn","joyc"
$b="roh","dhaw","kohl"
$c="steyn","abd","faf","roh","dhaw"

推荐答案

一个可行的解决方案可能是使用 -notcontains 运算符，如 arco444 建议的那样，循环遍历 $a 数组元素并检查它们是否至少包含在其他数组之一中.

A viable solution could be using -notcontains operator as suggested by arco444, cycle through $a array elements and check if they are contained at least in one of the other arrays.

这是一段代码

foreach($a_value in $a) {
    if (($b -notcontains $a_value) -and ($c -notcontains $a_value)) {
        "$a_value is extra"
    }
}

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