Io version of 'How strict is your dynamic language?'

Original article.

Unnatural version which is like the other languages.

names := list(
    Map clone atPut("first", "Bob") atPut("given", "Smith"),
    Map clone atPut("given", "Lukas"),
    Map clone atPut("first", "Mary") atPut("given", "Doe")
)

printName := method(name,
    writeln("Name is ", name at("first"), " ", name at("given"))
)

names foreach(name,
    printName(name)
)

Natural Io version of the code.

Name := Object clone do(
    newSlot("first")
    newSlot("given")

    printName := method(
        writeln("Name is ", first, " ", given)
    )
)

names := list(
    Name clone setFirst("Bob") setGiven("Smith"),
    Name clone setGiven("Lukas"),
    Name clone setFirst("Mary") setGiven("Doe")
)

names foreach(printName)

Both versions run without error or warnings and produce the following output.

Name is Bob Smith
Name is nil Lukas
Name is Mary Doe