And that way you can use a data type Animal for equality or as a string. To treat it like a boolean value, there's another typeclass called BoolValue that can do that.
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I'm no Haskell expert. But Haskell typeclasses allow you to do that.
To understand the basics, look at typeclasses like C# or Java interfaces, they define one or more methods that your
instance
s should implement.Eq
is a typeclass that allows you to evaluate a value as a boolean.Show
is a typeclass that represents a value as a readable String.Then assuming you have the following data type:
You can also write the following:
And that way you can use a data type
Animal
for equality or as a string. To treat it like a boolean value, there's another typeclass called BoolValue that can do that.