PowerShell: Iterate Array

ForEach-Object (cmdlet)

ForEach-Object cmdlet is most useful when you need to Pipe a collection to it.

(ForEach-Object has alias %, foreach)

syntax:

ForEach-Object ScriptBlock

1..7  | ForEach-Object {$_}

Foreach (statement)

foreach-statement must be on a single line, when used in PowerShell prompt.

$aa = 1..9
foreach ($x in $aa) { echo $x }
# prints 1 to 9

ForEach (PowerShell Intrinsic Method)

ForEach is a hidden “intrinsic member” that PowerShell adds to every object.

syntax:

arrayX.ForEach(script_block)

iterate over array. In the script block, $_ is the value of current element.

$aa = 0..3
$aa.foreach({$_ + 1})

for (statement)

$aa = 1..9
for ($i=0; $i -le $aa.length; $i++) { $aa[$i] }
# prints 1 to 9

while (statement)

$aa = 1..9
$i = 0;
while ($i -lt 5) {
    Write-Host $aa[$i];
    $i++
}
# prints 1 to 5