Powershell Foreach loop through dictionary with results to another dictionary. I can do with for loo-CodePudding

$scores = [ordered]@{
Jack = 81;
Mike = 78;
Mark = 99;
Jim = 64;
}

$grades = [ordered]@{}

$len = $scores.Count
for ($n=0;$n -lt $len; $n  ){
    if ($($scores.values)[$n] -gt 65){
        $grades  = @{$($scores.keys)[$n] = $($scores.keys)[$n]}
        $grades[$n] = $($scores.values)[$n] = "PASS"
    }
else{
    $grades  = @{$($scores.keys)[$n] = $($scores.keys)[$n]}
    $grades[$n] = $($scores.values)[$n] = "FAIL"
}
}

$grades

=======THE ABOVE WORKS IN POWERSHELL JUST FINE

*******BELOW IS THE PROBLEM IN POWERSHELL (This structure works in Python)

$scores = [ordered]@{
Jack = 81;
Mike = 78;
Mark = 99;
Jim = 64;

}

$grades = [ordered]@{}

foreach($key in $scores){
    if ($scores[$key] -gt 65){
        $grades[$key] = "PASS"
    }
    else{
        $grades[$key] = "FAIL"
    }
}

$grades

======== Here is the correct FOR loop output:

******** Here is the output from FOREACH:

Please show me how the FOREACH loop is failing.

(Any improvement on the FOR loop is frosting on the cake!)

CodePudding user response：

The foreach example is missing either .Keys (recommended to use .PSBase.Keys) or .GetEnumerator() in order to enumerate it:

$scores = [ordered]@{
    Jack = 81
    Mike = 78
    Mark = 99
    Jim  = 64
}

# - Using `.PSBase.Keys`

$grades = [ordered]@{}
foreach($key in $scores.PSBase.Keys) {
    if ($scores[$key] -gt 65) {
        $grades[$key] = "PASS"
        continue
    }
    $grades[$key] = "FAIL"
}

# - Using `.GetEnumerator()`

$grades = [ordered]@{}
foreach($pair in $scores.GetEnumerator()) {
    if ($pair.Value -gt 65) {
        $grades[$pair.Key] = "PASS"
        continue
    }
    $grades[$pair.Key] = "FAIL"
}