If there is only one parameter then it can't be a named argument list so your code could assume that if it receives more than a single argument then it must be a named parameter list and assign to a hash:

sub test {
    my ($self, @args) = @_;
    my %params;

    if (@args > 1) {
        %params = @args; # Will warn if @args has an odd number of ele
+ments
    } else {
        ... # Handle single argument
    }
}
[download]

However, it is safer and a recommended practise to pass named arguments as a hash reference:

test ({this => 1, that => 2});

sub test {
    my ($self, $args) = @_;
    my %params;

    if ('HASH' eq ref $args) {
        %params = %$args;
    } else {
        ... # Handle single argument
    }
}
[download]

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