[stochastic_monk]

Meaning that the underscore allows them to be used as positional arguments instead of being only accessed by "keywords", to use a python analogy?

[emp]

They are still positional in Swift. color(r: 255, g: 255, b: 255) is not the same as color(b: 255, g: 255, r: 255). Also the parameter names are part of the method signature.