default values in ruby

gistfile1.rb

#check python https://gist.github.com/kianxineki/aa10199ba96d0d4009c6
def append_values(new_value,a=[])
    a.push(new_value)
    return a
end

append_values("n1") # result ['n1']
rlist = append_values("n2") # result ['n2']
rlist.push("n3")
print rlist # result ['n2', 'n3']
append_values("n3") # result ['n3']
append_values("n4", []) # result ['n4']
append_values("n5") # result ['n5']