Advent of code?

https://adventofcode.com
Yearly event since 2015
25 puzzles, one each day, starting December 1st
Any language(Excel, APL, SQLite, ABAP)
By Eric Wastl @ericwastl
Puzzle input is unique for each user

Example: 2020 Day 01

Find the two entries that sum to 2020

1721, 979, 366, 299, 675, 1456

1721 + 299 = 2020
Puzzle answer is 1721 * 299 = 514579

But why?

Practice problem solving
Learn a new programming language
Practice TDD
Optimizing solution performance
Make your own twist

My Recommendations

Know your regex, https://regex101.com
Just submit answers, it doesnt have to be perfect
Checkout the Community:

SAP Community

My twist

In ABAP
Using somewhat modern ABAP syntax(740+)
Share code on GitHub
Run on Node.js
Wait, what?
Continuous Integration: Static analysis
Continuous Integration: Run unit tests

1. Git

Decentralized version control system, it allows you to:

Compare changes over time
Rollback files to old version
Track who changed what

GitHub
Hosting service for git, free for public projects.

Provides graphical web interface
Collaboration via Pull Requests

	started ~5 years ago		~100000 lines
	~4300 commits		7.02 and up
	110+ contributors		MIT License

abapGit Design Goals

Easy installation
Easy upgrade
Small system footprint
Code readable in git repository

Resources

2. Static Analysis

abaplint

lint, or a linter, is a tool that analyzes source code to flag programming errors, bugs, stylistic errors, and suspicious constructs

Open Source
MIT License
TypeScript
abaplint.org

syntax

rules.abaplint.org

playground.abaplint.org

abaplint - Use Cases

Continuous Integration?

Use CI that is close to the code, GitHub Actions/Apps
Exact + Fast feedback

3. Automatic Downport

CLASS lcl_bar DEFINITION.
ENDCLASS.
CLASS lcl_bar IMPLEMENTATION.
ENDCLASS.

FORM foo.
  DATA(lo_moo) = NEW lcl_bar( ).
ENDFORM.

https://rules.abaplint.org/downport/ https://playground.abaplint.org

4. Transpiling

LOOP AT lt_strings INTO lv_string1.
  LOOP AT lt_strings INTO lv_string2.
    IF lv_string1 + lv_string2 = 2020.
      output = lv_string1 * lv_string2.
      output = condense( output ).
      WRITE output.
      RETURN.
    ENDIF.
  ENDLOOP.
ENDLOOP.

for (const unique1 of abap.statements.loop(lt_strings)) {
  lv_string1.set(unique1);
  for (const unique2 of abap.statements.loop(lt_strings)) {
    lv_string2.set(unique2);
    if (abap.compare.eq(abap.operators.add(lv_string1,lv_string2), constant_2020)) {
      output.set(abap.operators.multiply(lv_string1,lv_string2));
      output.set(abap.builtin.condense(output));
      abap.statements.write(output);
      return;
    }
  }
}

5. All Together Now

https://github.com/larshp/abap-advent-2020

Automatic Upport

Future Work

Serverless ABAP, https://github.com/open-abap
Unit Testing of ABAP code, https://allure.abapgit.org
Database Support, basic SQLite done

#ABAPisNotDead

https://larshp.github.io/advent-2020-presentation/

@LarsHvam

Links

abapgit.org
abaplint.org
dotabap.org

Disclaimer

Open source

Test in sandbox