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You're supposed to distinguish between functions with side effects and those with none.

What about methods that have arguments and no side-effects, like a special getter that accesses a value in a Map of Maps? or functions that flush state to I/O while doing other stuff and returning a value?

Why only make a special weird distinction for arg-less methods? And why enable different ways of defining the method that can optionally require you to omit parentheses rather than choose to do it only when you choose to write a function that embodies that convention?

If you want a way to indicate side effects, make it a part of the type system like in Haskell. Such a silly convention is unhelpful and I think fails even at the intended goal because it confuses people thinking it’s not involving the overhead of a function call.

Doesn't seem that different from the C# concept of properties, except with a bit less language support. To me it doesn't seem that worth worrying about the overhead of trivial function calls in the general case.

But they often aren’t trivial, e.g. like breeze conversions to Scala data structures that appear like simple attribute accesses and don’t indicate at all that really they are complex function calls with important performance considerations.

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