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trite / hackerrank-reasonml

Project I'm using to do HackerRank problems in ReasonML

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Quick Getting Started:

clone the repo and cd into the local folder you save to (in this case blarghle):

$ git clone git@github.com:trite/hackerrank-reasonml.git blarghle
Cloning into 'blarghle'...
remote: Enumerating objects: 19, done.
remote: Counting objects: 100% (19/19), done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 19 (delta 1), reused 19 (delta 1), pack-reused 0
Receiving objects: 100% (19/19), 283.99 KiB | 1.08 MiB/s, done.
Resolving deltas: 100% (1/1), done.
trite@DESKTOP-0ACBTNR:/mnt/c/git$ cd blarghle/

npm install next:

$ npm install
npm WARN deprecated source-map-url@0.4.1: See https://github.com/lydell/source-map-url#deprecated
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated source-map-resolve@0.5.3: See https://github.com/lydell/source-map-resolve#deprecated
npm WARN deprecated sane@4.1.0: some dependency vulnerabilities fixed, support for node < 10 dropped, and newer ECMAScript syntax/features added

added 580 packages, and audited 581 packages in 31s

34 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

You should now be able to npm run build:

$ npm run build

> hackerrank-reasonm@0.1.0 build
> bsb -make-world

Dependency on @glennsl/bs-jest
bsb: [5/5] src/jest.cmj
bsb: [7/7] install.stamp
Dependency Finished
bsb: [9/9] src/CompareTheTriplets.cmj

Last but not least executing an existing src/*.re file locally and feeding it input (2nd and 3rd lines below) via node:

$ node src/AVeryBigSum.bs.js
5 # <-- Manually entered --v
1000000001 1000000002 1000000003 1000000004 1000000005
5000000015 # <-- Output

HackerRank-ReasonML

Project for making it easier to turn ReasonML into JavaScript targeted at HackerRank. Meaning you can:

Step 0. Pre-requisites

You will need to run an npm install if you haven't yet for your local copy of this repo.

Step 1. Write some ReasonML

Write your ReasonML code to solve the problem (this is still a bit hairy for me right now, cleaning things up eventually):

// https://www.hackerrank.com/challenges/a-very-big-sum/problem

Readline.readline(_ => {
  Readline.readline(line2 => {
    line2
    |> Js.String.split(" ")
    |> Js.Array.map(Int64.of_string)
    |> Js.Array.reduce(Int64.add, 0L)
    |> Int64.to_string
    |> Js.log;

    Readline.close();
  });
});

Step 2. Compile and package to JS

This builds all Reason files in the src folder, despite the drawbacks which I am hastily ignoring forever for now. The file you specify will then be packaged into dist/main.js to be submitted to HackerRank.

It's a bit awkward having to specify a .bs.js file, especially if you haven't compiled the code since creating the corresponding .re file, need to think of better ways to handle this still.

$ npm run hackify ./src/AVeryBigSum.bs.js 

> hackerrank-reasonm@0.1.0 prehackify
> npm run build


> hackerrank-reasonm@0.1.0 build
> bsb -make-world

Dependency on @glennsl/bs-jest
Dependency Finished

> hackerrank-reasonm@0.1.0 hackify
> npx webpack build -t "node" --mode production --entry  "./src/AVeryBigSum.bs.js"

asset main.js 20.4 KiB [compared for emit] [minimized] (name: main)
modules by path ./node_modules/bs-platform/lib/js/*.js 52.5 KiB
  ./node_modules/bs-platform/lib/js/int64.js 1.34 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_int64.js 12.5 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_format.js 19.4 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_primitive.js 2.65 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_js_exceptions.js 641 bytes [built] [code generated]
  ./node_modules/bs-platform/lib/js/curry.js 11.9 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_option.js 1.5 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_exceptions.js 492 bytes [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_array.js 2.17 KiB [built] [code generated]
modules by path ./src/ 1.08 KiB
  ./src/AVeryBigSum.bs.js 629 bytes [built] [code generated]
  ./src/utils/Readline.bs.js 476 bytes [built] [code generated]
external "readline" 42 bytes [built] [code generated]
webpack 5.72.1 compiled successfully in 915 ms

Submit to HackerRank

If everything successfully built and packaged then the output of dist/main.js should be ready for HackerRank. Example: It may look like word vomit, but isn't it too adorable not to love?

But doesn't that mean there are answers to hackerrank in here?

Yes, and they're a billion other places online. I'm not here to police other people on how they're using this code, please be responsible and do not use it to cheat.

TODO: Create a template of this project from an earlier commit, this is my repo to work out of for now.

VSCode OCaml Platform extension troubleshooting

If you're having any issues with the OCaml Platform extension (used to hook VSCode up to the ocaml-lsp-server for intellisense-y goodness) here are a few things worth trying:

0. NPM Install

If you haven't yet run it on your local copy of this repo you need to before doing any further troubleshooting:

$ npm install

1. Version check

You should be running on version 4.06 of the ocaml compiler:

$ opam switch list
#  switch   compiler                    description
   4.06.1   ocaml-base-compiler.4.06.1  4.06.1
→  4.12.0   ocaml-base-compiler.4.12.0  4.12.0
   4.14.0   ocaml-base-compiler.4.14.0  4.14.0
   default  ocaml-system.4.08.1         default

If you have 4.06 available but not active, you can activate it (use your version number):

$ opam switch 4.06.1

If it wasn't installed, install it with:

$ opam switch create 4.06.1

2. LSP pre-reqs

Make sure lsp and lspformat (and/or lspformat-rpc) are installed TODO: rest of this one

3. LSP error logs

Check error messages in LSP by enabling them and all that TODO: rest of this one too

Can't resolve 'blah.bs.js' in 'path'

Make sure you're running the hackify command with a path that is exact. src/File.bs.js will fail, while ./src/File.bs.js will work:

$ npm run hackify src/DiagonalDifference.bs.js 

> hackerrank-reasonm@0.1.0 prehackify
> npm run build


> hackerrank-reasonm@0.1.0 build
> bsb -make-world

bsb: no work to do.
[3/3] Building src/DiagonalDifference.cmj

> hackerrank-reasonm@0.1.0 hackify
> npx webpack build -t "node" --mode production --entry  "src/DiagonalDifference.bs.js"

assets by status 0 bytes [cached] 1 asset

ERROR in main
Module not found: Error: Can't resolve 'src/DiagonalDifference.bs.js' in '/Users/paul/git/_sandbox/hackerrank-reasonml'
Did you mean './src/DiagonalDifference.bs.js'?
Requests that should resolve in the current directory need to start with './'.
Requests that start with a name are treated as module requests and resolve within module directories (node_modules).
If changing the source code is not an option there is also a resolve options called 'preferRelative' which tries to resolve these kind of requests in the current directory too.
resolve 'src/DiagonalDifference.bs.js' in '/Users/paul/git/_sandbox/hackerrank-reasonml'
  Parsed request is a module
  using description file: /Users/paul/git/_sandbox/hackerrank-reasonml/package.json (relative path: .)
    resolve as module
      looking for modules in /Users/paul/git/_sandbox/hackerrank-reasonml/node_modules
        /Users/paul/git/_sandbox/hackerrank-reasonml/node_modules/src doesn't exist
      /Users/paul/git/_sandbox/node_modules doesn't exist or is not a directory
      /Users/paul/git/node_modules doesn't exist or is not a directory
      /Users/paul/node_modules doesn't exist or is not a directory
      /Users/node_modules doesn't exist or is not a directory
      /node_modules doesn't exist or is not a directory

webpack 5.72.1 compiled with 1 error in 96 ms
$ npm run hackify ./src/DiagonalDifference.bs.js

> hackerrank-reasonm@0.1.0 prehackify
> npm run build


> hackerrank-reasonm@0.1.0 build
> bsb -make-world

bsb: no work to do.
bsb: no work to do.

> hackerrank-reasonm@0.1.0 hackify
> npx webpack build -t "node" --mode production --entry  "./src/DiagonalDifference.bs.js"

asset main.js 38.3 KiB [emitted] [minimized] (name: main)
modules by path ./node_modules/bs-platform/lib/js/*.js 94.6 KiB
  ./node_modules/bs-platform/lib/js/caml_array.js 2.24 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/pervasives.js 17.4 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_format.js 19.4 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/curry.js 11.9 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/js_list.js 5.18 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_io.js 1.81 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_sys.js 2.23 KiB [built] [code generated]
  ./node_modules/bs-platform/lib/js/caml_bytes.js 2.99 KiB [built] [code generated]
  + 9 modules
modules by path ./src/ 4.31 KiB
  ./src/DiagonalDifference.bs.js 1.77 KiB [built] [code generated]
  ./src/utils/Trelude.bs.js 901 bytes [built] [code generated]
  ./src/utils/Readline.bs.js 1.66 KiB [built] [code generated]
external "readline" 42 bytes [built] [code generated]
webpack 5.72.1 compiled successfully in 528 ms

About

Project I'm using to do HackerRank problems in ReasonML

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Language:Reason 82.2%Language:C++ 16.7%Language:JavaScript 1.1%