Compare two arrays, if values are in array, add to list, if not add values to another list. No dupli-CodePudding

please look at the comments in code and see if you can help me with this I am checking to see if a value from $arr1 is in $arr2. If it is, add it to a list, if it is not, add it to another list. Make sure both list/arrays do not have duplicates.

$arr1 = @(1,2,3,4,4,2,5,7,9,9,1) 
$arr2= @(5,1,2,3,6,8,1) 
$NotinList = @()
$inList = @()
$counter = 0

for ($i = 0; $i -lt $arr1.length; $i  ){
    for( $j = 0; $j -lt $arr2.length; $j   ){  
        if($arr1[$i] -ne $arr2[$j]){ #check to see if value from $arr1 is in $arr2
            for($k = 0; $k -lt $NotinList.length; $k  ){ #Traverse through empty array
                write-host $arr1[$i]  
                if($NotinList[$k] -ne $arr1[$i]){                                        # *^ if empty array does not alreadycontain item from big $arr1, add it.
                    $NotinList  =  $arr1[$i]
                }
            }
        }
        else{
            $inList  = $arr1[$i]

            #how would I remove duplicates from number in list since there are repeating numbers in $arr1 that are not in $arr2.

        }
}
$counter   #keep track may use for something else??
}

CodePudding user response：

I would eliminate the duplicates first and then use the Where() array operator to split the array into the variables.

$arr1 = 'a','b','b','c','d','e','e','f','g'
$arr2 = 'a','b','c','g'

# not in list = d, e, f
# in list = a, b, c, g

$inlist,$notinlist = ($arr1 | Get-Unique).Where({$_ -in $arr2},'split')

Now here is what each contains

$notinlist
d
e
f

$inlist
a
b
c
g

CodePudding user response：

If you insist on doing it manually, I recommend using hashtables. They are extremely fast and the keys have to be unique.

If you care about the order you can use [ordered] hashtables

$arr1 = 1,2,3,4,4,2,5,7,9,9,1
$arr2= 5,1,2,3,6,8,1

$inlist = [ordered]@{}
$notinlist = [ordered]@{}

foreach($entry in $arr1){
    if($entry -in $arr2){
        if($entry -notin $inlist.keys){
            $inlist.$entry = $entry
        }
    }
    else{
        if($entry -notin $notinlist.keys){
            $notinlist.$entry = $entry
        }
    }
}

Now your unique lists are in either/both they keys or the values

$inlist.Keys

1
2
3
5

$notinlist.Values

4
7
9