Ruby true or false

The test

def true?(x)
    if x
        return "true"
    else
        return "false"
    end
end

tests = [false,true,0,1,nil,[],{},"","0","1","true","false"]

tests.each do |test|
    puts test.inspect+":\t "+true?(test)+" ("+test.class.to_s+")"
end

The results

false:   false (FalseClass)
true:    true (TrueClass)
0:       true (Fixnum)
1:       true (Fixnum)
nil:     false (NilClass)
[]:      true (Array)
{}:      true (Hash)
"":      true (String)
"0":     true (String)
"1":     true (String)
"true":  true (String)
"false":         true (String)

For later reference.