I'm a beginner in haskell and I wonder about the right way to define a new type. Suppose I want to define a Point type. In an imperative language, it's usually the equivalent of:
data Point = Int Int
However in haskell I usually see definitions such as:
data Point = Point Int Int
What are the differences and when should each approach be used?
In OO languages you can define a class with something like this
class Point {
int x,y;
Point(int x, int y) {...
}
it's similar
data Point = ...
is the type definition (similar to class Point above , and
... = Point Int Int
is the constructor, you can also define the constructor with a different name, but you need a name regardless.
data Point = P Int Int
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