J: From C to C++20
:warning::warning::warning: THIS PROJECT IS ON PAUSE AT THE MOMENT :warning::warning::warning:
J is an array programming language created by Ken Iverson and Roger Hui (see image below).
This is a fork of jsoftware/jsource and we will be porting it to C++20.
Motivation
The motivation for this is to learn about how Ken Iverson / Roger Hui implemented the J language (and similarly APL as J is the successor to APL). The end goal is to learn as much as possible.
Try J
If you would like to try J without building from source, check out this site: http://tryj.freeddns.org/
Goals
- [x] Reduce complexity of build options
- [ ] Compile with GCC 10+
- [ ] Compile with Clang 11+
- [ ] Remove all (most) of the macros
- [x] Clang-format the code base
- [ ] Clang-tidy the code base
- [x] Set up CI (Buildkite)
- [ ] Set up Code Coverage
- [x] Set up badges
- [x] Get both build / tests running in parallel
- [x] Parallel build (for free off of zhihaoy branch)
- [x] Parallel tests
- [ ] Monitor compile & run time perf while refactoring
Non-Codebase Goals
- [ ] Learn to not use mouse
Comparison of Languages
Calculating the first 10 odd numbers:
| Language | Code | Runnable Link |
|---|---|---|
| J | 1+2*i.10 |
j playground |
| APL | ¯1+2×⍳10 |
TryAPL |
| R | -1+2*seq(10) |
|
| Python | [1 + 2 * i for i in range(10)] |
Godbolt |
| Haskell | map (1+) $ map (2*) [0..9] |
OneCompiler |
| Haskell | map ((+1) . (*2)) [0..9] |
OneCompiler |
| Haskell | take 10 [1,3..] |
OneCompiler |
| C++ | transform(iota(0, 10), [](auto e) { return e * 2 + 1; }) |
Godbolt |
| C# | Enumerable.Range(0, 10).Select((int i) => { return i * 2 + 1; }) |
|
| Java | IntStream.range(0, 10).map(x -> x * 2 + 1).toArray(); |
|
| Ruby | (0..9).map { \|i\| i * 2 + 1 } |
Try It Online |
Getting started & Building:
For building this repository, please see CONTRIBUTING.md.
Image of Ken Iverson and Roger Hui
