JFP is a typed library, using Signet typing to ensure APIs are well defined and communicate their behavior and intent to the programmer. Most functions are enforced with sum types and wild cards to provide broader flexibility while still providing guard rails to help keep the programmer from getting lost.
At its most basic level, JFP can be used as a toolbox, providing helper functions to accomplish common tasks. As a programmer becomes more familiar with functional programming and the JFP API, the library becomes a language-as-a-library system for writing expressive programs and moving toward function expressions and away from imperative behaviors.
All curried functions in JFP are strictly curried. This means a function which declares a curried output will not optionally accept all arguments up-front. Although this leads to expressions which could be a little more parenthesis heavy, it also helps make the language and behaviors act as a cohesive, well-defined whole.
In the end, JFP is a functional programming system which is built around solving problems and chooses clarity through clear definitions over optional behaviors and confusing APIs.