PowerShell: Iterate Over Array

Array Method: ForEach

ForEach method is useful when you want to go thru all the values of array.

arrayX.ForEach(script_block)

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

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

arrayX.ForEach(property_name_str)

list each element's property.

@(dir).foreach("lastAccessTime")

arrayX.ForEach(property_name_str, new_val)

set each element's property to a new value.

arrayX.ForEach(method_name_str)

call a method on each element.

@(dir -name).foreach("toUpper")

PowerShell Statement: Foreach

foreach statement is useful when you want to go thru all the values of array or collection.

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

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

ForEach-Object Cmdlet

ForEach-Object cmdlet (alias %, foreach) can be used by piping array to it.

ForEach-Object ScriptBlock

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