ncalc
functionaljava
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ncalc | functionaljava | |
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2 | 3 | |
649 | 1,585 | |
- | 0.4% | |
2.6 | 0.0 | |
almost 3 years ago | 12 months ago | |
Java | Java | |
GNU General Public License v3.0 only | - |
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ncalc
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More fully featured/all in one app alternatives compared to the more basic/simple stock apps, "tools" etc?
So for example Calculator N+ (github link) is more of a mathematics suite with a calculator attached to it than a calculator app, are there any other good apps that can replace more barebones stock apps? Things like a compass, recorder, file manager, radio, clock etc, or anything else that springs to mind
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NCALC+ (ANDROID)
Source: https://github.com/tranleduy2000/ncalc
functionaljava
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How to write this (3) Java lines in a functional style?
A few side-notes about this code: - you need some sort of "wrapper" or "container" in order to use functional methods like map/flatMap/filter/etc on some object - here I used Optionalfor testing because it's available in standard Java: Optional describes an object that may or may not be available. - A more suitable "wrapper" for this use-case could have been Try which describes the result of an execution that may succeed or fail, see vavr has a Try for example, functionaljava has Either - map transforms A -> B (would make sense for your mapToUser) whereas flatMap transforms A -> Optional (or whichever "wrapper", would make sense for your userService.save if suppose the saving operation can fail) - Here is a working example for you :) - practise exercises: 1- replace the "wrapper" Optional with List, there is almost no change of code, this now gives you the ability to process lists of users 2- import vavr and replace the "wrapper" Optional with Try, there is almost no change of code, this now gives you the ability to process operations that may fail - Enjoy functional programming, you'll find java is rather verbose and quickly gets clunky for FP, consider switching to another language
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Show HN: Pidove, an Alternative to the Java Streams API
? Sometimes passing a lambda (or other function) as an argument is a simpler approach to specialization than defining a subclass. That I think is mainstream and accepted in Java today.
There is a lot more to "functional programming" than that, such as the use of persistent collections. In some cases (such as managing the symbol table in a compiler) those methods lead to good efficiency and great simplification, in other cases they are ways to make easy problems punishingly hard.
pidove builds on top of ordinary Java Collections and doesn't push more exotic approaches as does
http://www.functionaljava.org/
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OCaml modules vs C#/Java OOP
We can simulate using type components in modules in Java by using parametrized classes, the type parameters correspond to type declarations in a ML signature. I found an example monoid definition in Java if you want to see how that looks. You can see that the "functors" are kept inside the class definition, though I don't know if it's necessary, I don't really know Java. You probably get weaker abstraction, because you can't have some monoid with an unknown carrier type, you always know the carrier type - it's just the type parameter A in Monoid.
What are some alternatives?
nerdamer - a symbolic math expression evaluator for javascript
JFXShader - Allows custom effect shaders in JavaFX
microMathematics - microMathematics Plus - Extended visual calculator
act-pbt - Property based testing for act state machines.
obsidian-mathpad - Computer Algebra System (CAS) for Obsidian.md
λ - Functional patterns for Java
derive4j - Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, folds, optics and typeclasses.
property-based-matrix-testing-tutorial - Property-based matrix testing in Java
nasc - Do maths like a normal person
metaocaml-frex
roman-arabic-calculator - This code is a proof of concept. The calculator can work with both Arabic (1,2,3,4,5 ...) and Roman (I, II, III, IV, V ...) numbers.
purefun - Functional Programming library for Java