Lists in Haskell : data type or abstract data type?

You're confusing mutability with data structure. It is a proper list — just not one you're allowed to modify. Haskell is purely functional, meaning values are constant — you can't change an item in a list any more than you could turn the number 2 into 3.

Instead, you perform calculations to create new values with the changes you desire.

Haskell is a purely functional programming language. This means no change can be done at all.

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