if( <condition> ) {
    ...
}
else {
    ...
}
otherwise {

}

my $var = <COND> ? $a :: $b :: $c;

##</code><code>##

unless( <cond> ) {
    ...
}
else {
    ...
}

##</code><code>##

if( $loginAttempted ) {
    if( $loginSuccessful ) {
        ...
    }
    else {
        ...
    }
}
else {
    ...
}