here's an example alias:

alias tests {
  switch $1 $&
    case 1: $&
    echo -a Hello $!+ $!chr(124) $chr(124) echo -a World! $&
    break $&
    case 2: $&
    echo -a Hello World! $&
    break $&
    case 3: $&
    echo -a $me $&
    break $&
    default: $&
    echo -a Default case $&
    break
}