What do the letters enclosed in brackets signify?

I am currently working with a library known as Monet.js, and within the documentation, there are descriptions that look like this:

Maybe[A].map(fn: A => B) : Maybe[B]

I am unsure of what the letters inside the brackets stand for.

Is there anyone who could assist me with this?

Answer №1

JavaScript does not natively support generic types, but understanding them can be valuable when working with Monads. For example, the List monad requires a specific type, such as a string or integer, to be used in its construction. This results in Lists of Strings, Lists of Integers, or more generally Lists of As where A represents a placeholder for the type you intend to use. While JavaScript allows flexibility in this regard, it's important to consider the types being utilized. To illustrate, one might denote generics or type parameters as follows:

List[A]

This signifies a List containing elements of type A, with the responsibility of tracking types left to the programmer.

For more information, refer to the documentation available in the monet.js readme.

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