🍩 Torus

A simple additional functional programming support for Java 8+.

1. Applicative Functor

• Apply(f(a -> b -> ...) <*> a ...) and lift((a -> b -> ...) <$> a <*> b ...) functions for List, Stream, Optional and CompletedFuture classes.
• Functions to be applied must be in curried a form.

2. Curry

• Currying for uncurried functions.
• Parameter order flipping for curried functions.
• Currying supports functions with upto 4 parameters.

3. List Splitter

• Splits a list to chunks of size N. Returns List<List<T>>.

4. Tuple

• Pair(2-Tuple) and Triplet(3-Tuple) classes with zip/unzip functions from/to lists or streams.
• Zip function packs Nth elements from each lists or streams and converts them to stream of tuples.
• Tuples contain elements of heterogeneous types.

5. Collection Manipulation Wrappers

• Returns the collection itself after manipulations.
• e.g. ThisList.sort(l) returns the list itself after sorting, compared to void of java.util.Collections.sort(l).
• Separate classes for Collection, List, and Map.
• beginChain(Collection c), endChain() method for chaining manipulation methods.

6. Try

• Converts checked exceptions to runtime exceptions for usages in lambdas.
• Converts exception throwing functions to functions returning Optionals.
• Converts exception throwing functions to return default value.

7. Trampoline(safe tail recursion)

• Trampoline object in heap for tail recursion without possible stack overflow.

Example usages included in the test code.