Looping through a hash table, finding a value less than a number, and adding that to a new hashtable

I have a server name as a key and its available space as its value like:

    $hash= @{}
#in the loop I get the server name and then I get the space as an integer and add it to the table like:
    $hash.add($server,$space)

after the loops are complete, I want to go through the list and add the servers with a space less than 80 to a different table using

    $badServers = foreach($entry in $serverSpace){
    if($entry.Keys -le 80){
    $badServers.add($entry) 
    }}

but my output ends up putting every server into $badServers. Its as if the Values arent actually whats listed. Not sure what Im doing wrong.

Solution

Assuming the values of your hashtable are of the type [int], for example:

PS /> $hash

Name                           Value
----                           -----
SERVER0                        93   
SERVER1                        87   
SERVER2                        84   
SERVER3                        92   
SERVER4                        83   
SERVER5                        58   
SERVER6                        95   
SERVER7                        62   
SERVER8                        81   
SERVER9                        84   
SERVER10                       59

You could do something like this:

$result = foreach($key in $hash.Keys)
{
    if($hash[$key] -lt 80)
    {
        [pscustomobject]@{
            Server = $key
            Space = $hash[$key]
        }
    }
}

And looking at $result you would get something like this:

PS /> $result

Server   Space
------   -----
SERVER5     58
SERVER7     62
SERVER10    59

If values were stored as [string] but holding an actual integer you would need to change the condition a bit:

if([int]$hash[$key] -lt 80){ ... }

Edit Note:

Actually, my bad here, PowerShell is smart enough to know how to compare a string holding a number with an integer. There is no need to cast [int].

And, for example, if the hash was holding values like 123 Gb, i.e.:

PS /> $hash

Name                           Value
----                           -----
SERVER0                        94 Gb
SERVER1                        80 Gb
SERVER2                        82 Gb
SERVER3                        89 Gb
...
...

You could do something like:

if([regex]::Match($hash[$key],'\d+').Value -lt 80){ ... }

Which would yield:

PS /> $result

Server   Space
------   -----
SERVER5  52 Gb
SERVER6  53 Gb
SERVER8  69 Gb
SERVER9  72 Gb
SERVER10 65 Gb