# Das einfachste Beispiel
$a = "Hi"
$b = "Attendees"
"{0}" -f $a,$b
"{1}" -f $a,$b
"{0} {1}" -f $a,$b
"{0} ------------------ {1}" -f $a,$b

# Lets do a better example
[array]$formatArray = @('you','values','they')
$user               = (Get-ChildItem Env:\USERNAME).Value
$date               = Get-Date

"Your username is {0}, and the time is {1:HH}:{1:mm}:{1:ss}" -f $user,$date
# IMPORTANT - Format-keywords are case-sensitive
"Your username is {0}, and the time is {1:HH}:{1:MM}:{1:ss}" -f $user,$date

# Formatieren von Arrays
"Those {1} appear where {0} {2} place them" -f $formatArray
"Those $($formatArray[1]) appear where {0} {2} place them" #-f $formatArray

# Formatieren direkt in der Pipeline
Get-Process |Select-Object -first 3 {"Processname is: {0} and this ID is {1}" -f $_.ProcessName,$_.id}

# Padding (,10 means 10 digits for a row) and Hex-Values
'|{0,10}|0x{1:x}|{2,-10}|' -f 10,15,30
 
# Currency format
'Amount: {0:c}' -f 123
'Amount: {0:c}' -f 123456,78

# Zahlenformate
'Amount: {0:n}' -f 123456.22
'Amount: {0:n1}' -f 123456.22
'Amount: {0:n2}' -f 123456.22
'Amount: {0:n3}' -f 123456.22

# Percent values
'{0:p}' -f 0.80

# date-games
$now = Get-Date
'{0}' -f $now
'{0:dd}' -f $now
'{0:dddd}' -f $now
'{0:MM}' -f $now
'{0:yyyy}' -f $now
'it was {0:dddd}, the {0:dd}.{0:MM}.{0:yyyy} at {0:HH} Uhr {0:mm}!' -f $now

# More on https://ss64.com/ps/syntax-f-operator.html