Script Block

Script Block is a special object in powerhsell, it looks like a syntax that creates a new scope in the flow, but itself can be stored in a variable. So it's more like a anonymous function, you may call it as lambda expression.

Creation

$action = {
    echo 'hello from script block'
}

$func = {
    param($foo, $bar)
    return "$foo$bar"
}

From String

$script = [scriptblock]::Create('echo hello')
& $script # hello

Invoke a Script Block

& { 1, 2 }
# 1
# 2

& { param($a, $b) $a, $b } 'a' 'b'
# a
# b

# store result to variable
$arr = & { param($a, $b) $a, $b } 'a' 'b'

Script Block as Lambda

As a replacement for lambda expression.

$arr = @(1, 2, 3, 5)
$arr.Where({ $_ -lt 4 })