@mfjs/core NPM

mfjs-core

Library provides utilities for implementing monads with interfaces compatible with mfjs compiler.

It doesn’t implement any concrete effects but it contains tools for monads construction used by in other libraries.

Monad is encoded in the library using simple object with a set of functions for operations. It exports a prototype with a set of default implementations as MonadDict. There are also a few transformers for definitions. They add some common boilerplate features into concrete monad definitions.

Library stores global context with current monad definition to allow usage of several monads within same project. There are M.setContext, M.liftContext, M.withContext function to manage its value. To add context management into some definition use M.addContext transformer.

Because of global context storing it is critical only single instance of the library is loaded at the moment, for example using peer dependencies.

The generated code expects some functions to be method of monadic values. To add default implementations to prototype of monadic value use M.addMethods and M.completePrototype functions.

Sometime same data type may be used as monadic value of several monads, or developer simply doesn't want to pollute some probably external type with more prototype methods. To avoid this use M.wrap function.

M.withControlByToken transformer implements JS control operators using special value threading through monad steps and probably ignoring or changing behavior of some of them.

For more information about mentioned functions check API reference.