12 lines
747 B
Plaintext
12 lines
747 B
Plaintext
[[wp:Parametric Polymorphism|Parametric Polymorphism]] is a way to define types or functions that are generic over other types. The genericity can be expressed by using ''type variables'' for the parameter type, and by a mechanism to explicitly or implicitly replace the type variables with concrete types when necessary.
|
|
|
|
|
|
;Task:
|
|
Write a small example for a type declaration that is parametric over another type, together with a short bit of code (and its type signature) that uses it.
|
|
|
|
|
|
A good example is a container type, let's say a binary tree, together with some function that traverses the tree, say, a ''map''-function that operates on every element of the tree.
|
|
|
|
This language feature only applies to statically-typed languages.
|
|
<br><br>
|