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Passionate People Coding Challenges

Passionate People Coding Challenges

Instructions

run yarn test to run the latest challenge tests. Develop your solution in 2021/w<week number>/solution.js file until all tests pass. Since you will send the contents of this file as your solution, all your code should be in this 1 file.

WARNING!!: Do not commit your solution! as that will disclose your approach to others! The solution should be submitted via an upload link provided for each solution.

Evaluation

You can also run the evaluation locally and compare various versions of your solution. This is the same script that is running in the cloud. It can serve as a rough benchmark for relative performance. However, it might differ on the cloud machine due to different underlying hardware.

Run node evaluate.js -c [challenge] -d [durationInSeconds].

Ranking

Only correct solutions count. Failing at least 1 test case immediately disqualifies the solution. So you should make sure the solution works with the provided tests before submitting it. You can submit multiple versions of your solutions. At the end, only the fastest will be taken into account.

Ranking is based on performance. Fastest execution time (accross multiple tries) wins. F1 style points are awarded for each week.

  • 1st place: 25 points
  • 2nd place: 18 points
  • 3rd: 15
  • 4th: 12
  • 5th: 10
  • 6th: 8
  • 7th: 6
  • 8th: 4
  • 9th: 2
  • 10th: 1

Extra points

  • +5 points for the shortest solution (codegolf). Judged by the number of bytes your solution file has. If tied, both (or more) get awarded 5 points.
  • +5 points determined via voting procedure. Ties are also possible.
  • challenge creator gets as many points as participants in the challenge. (clamped to min: 10; max: 25)

Note: Since you can submit multiple solutions, the shortest and most elegant solution will be ranked apart from fastest. E.g. you can submit 3 solutions - one aimed to be fastest, another one to be the shortest and the 3rd one to be most readable/elegant/novel or otherwise noteworthy for the voting. It could very well be that a solution is both elegant and fast. So all correct solutions will be evaluated independently for each award category.

Voting process

Voting commences as soon as official run is completed. Each Slack member can run /vote command and select the best solution of the last week. The votes are counted after a week - the top one gets 5pts from jury. (ties are possible; then multiple get 5pts).

Proxibited solutions

  • mutating function inputs
  • caching inputs directly to results, so that consequent evaluation cases would simply return ready result from map

Example:

const cache = {};

module.exports = (input) {
  if (cache[input]) return cache[input];

  // expensive computation
  const result = ....

  cache[input] = result;

  return result;
}

Note: Caching is disallowed for mapping inputs directly to results! Caching intermediary results is not disallowed.

Fair play principles

In principle solution should rely only on JavaScript features to come up with correct solution inside the function that is being exported from the solutions file. Using built in Node API's is allowed as long as it doesn't meddle with execution of tests or evaluation, or takes unfair advantage in any other way.

Prohibited approaches include

  • requiring or meddling with test spec cases
  • meddling how tests are run and evaluated
  • meddling with how performance is evaluated
  • meddling with or overwriting node internals (module, require, etc.)
  • meddling with other solutions
  • running npm commands as child process etc.
  • using fs module to read/write other files/directories
  • doing system calls or web requests to extenal services/servers (unless it's part of challenge)

We reserve right to update this list or disqualify a solution if we see that it is taking an unfair advantage and/or is unfair to other solutions. This whole challenge concept is still a MVP and we iterate and improve as we go :) Thank you for your understanding ;)

Practical size limits

Since challenges are intended to be relatively small, solvable in short time and withhout excessive coding, there's a practical limit of max 2048 bytes per solution. This also prevents taking advantage and precoding responses to the test spec.

Tips and Tricks

List of ideas from our participants

Authoring

If you'd like to contribute and create a challenge, here are instructions for authoring one.

Results

2022

Place Name Week 05 Week 06 Week 07 Week 08 Week 09 Week 10 Week 11 Week 12 Week 13 Week 14 Week 15 Week 16 Week 17 Week 18 Week 19 Week 20 Week 21 Week 22 Week 23 Week 24 Week 25 Week 26 Week 27 Week 28 Week 29 Week 30 Week 31 Week 32 Week 33 Week 34 Week 35 Week 36 Week 37 Week 38 Week 39 Total points Place Name
1. Hossein 2 30 25 15 15 20 12 23 18 4 10 20 25 23 25 25 35 6 6 35 25 30 30 30 25 30 10 30 30 30 23 30 23 720 1. Hossein
2. Varun 35 25 6 2 20 30 25 10 8 30 10 12 6 15 35 15 17 15 15 25 15 15 18 10 30 15 459 2. Varun
3. Lee 15 25 30 8 25 8 25 6 12 8 4 10 6 10 6 15 2 4 10 7 6 12 10 10 18 25 12 23 8 30 25 10 12 8 445 3. Lee
4. Aman 10 25 25 25 25 15 8 25 12 30 12 10 30 25 15 8 20 25 30 10 15 25 425 4. Aman
5. Bram Kamies 10 14 2 4 25 35 15 35 25 18 25 17 18 12 30 15 35 18 35 388 5. Bram Kamies
6. Medhat 18 1 6 25 10 8 10 1 8 28 25 15 10 4 4 12 6 17 15 12 12 20 25 25 30 4 351 6. Medhat
7. Tom Atterton 6 12 35 15 17 9 6 30 30 16 30 15 15 12 248 7. Tom Atterton
8. Lars 15 20 35 35 35 35 25 18 2 15 235 8. Lars
9. Daan 2 10 7 12 10 15 4 6 12 25 15 10 12 10 15 1 8 18 23 9 8 232 9. Daan
10. Irene 25 8 18 23 15 25 10 12 11 13 12 25 197 10. Irene
11. Joseph 8 10 11 10 4 4 4 25 6 12 4 12 11 121 11. Joseph
12. Luc 30 25 15 70 12. Luc
13. Anuradha 11 10 11 10 10 10 6 68 13. Anuradha
14. Tim 5 4 18 6 6 17 10 66 14. Tim
15. Devin 2 4 4 7 4 12 15 8 56 15. Devin
16. Patrick 5 8 15 15 9 52 16. Patrick
17. Arpad 10 15 15 40 17. Arpad
18. Koodal 1 25 4 30 18. Koodal
19. Josef 25 2 27 19. Josef
20. Daan Houweling 6 15 21 20. Daan Houweling
21. Adjoa 6 6 4 16 21. Adjoa
22. Daniel 6 8 14 22. Daniel
23. Peter-Paul 13 13 23. Peter-Paul
24. Andre Muijen 6 4 1 1 12 24. Andre Muijen
25. Dexter 10 10 25. Dexter
26. Ji 6 2 8 26. Ji
27. Ali 6 6 27. Ali
28. Amine 4 4 28. Amine
29. Luuk 2 2 29. Luuk
30. Matthias 1 1 30. Matthias

September

Place Name Week 35 Week 36 Week 37 Week 38 Week 39 Total points
1. Hossein 30 30 23 30 23 136
2. Bram Kamies 30 15 35 18 35 133
3. Lee 30 25 10 12 8 85
4. Tom Atterton 30 15 15 12 72
5. Patrick 8 15 15 9 47
6. Varun 30 15 45
7. Medhat 30 4 34
8. Lars 15 15
9. Daniel 6 8 14
10. Tim 10 10
11. Ali 6 6

August

Place Name Week 31 Week 32 Week 33 Week 34 Total points
1. Hossein 25 30 10 30 95
2. Medhat 12 20 25 25 82
3. Lee 25 12 23 8 68
4. Varun 15 18 10 43
5. Irene 12 25 37
6. Bram Kamies 18 12 30
7. Anuradha 10 6 16
8. Joseph 11 11
9. Devin 8 8
Daan 8 8

July

Place Name Week 27 Week 28 Week 29 Week 30 Total points
1. Hossein 25 30 30 30 115
2. Varun 15 15 25 15 70
3. Bram Kamies 18 25 17 60
4. Lee 12 10 10 18 50
5. Medhat 15 12 27
Devin 12 15 27
7. Anuradha 10 10 20

June

Place Name Week 22 Week 23 Week 24 Week 25 Week 26 Total points
1. Bram Kamies 25 35 15 35 25 135
2. Hossein 25 35 6 6 35 107
3. Aman 25 30 10 15 25 105
4. Varun 15 35 15 17 82
5. Irene 25 10 12 11 13 71
6. Daan 1 8 18 23 9 59
7. Medhat 4 12 6 17 39
8. Lee 2 4 10 7 6 29
9. Daan Houweling 6 15 21
10. Tim 17 17
11. Tom Atterton 16 16
12. Devin 7 4 11
13. Dexter 10 10
14. Luuk 2 2

May

Place Name Week 18 Week 19 Week 20 Week 21 Total points
1. Hossein 20 25 23 25 93
2. Tom Atterton 9 6 30 30 75
3. Aman 25 15 8 15 63
4. Varun 30 10 12 6 58
5. Irene 18 23 15 56
6. Daan 10 12 10 15 47
7. Lee 10 6 15 31
8. Medhat 15 10 4 29
9. Joseph 12 4 7 23
10. Bram Kamies 14 2 4 20
11. Devin 4 4 8
12. Tim 6 6

April

Place Name Week 14 Week 15 Week 16 Week 17 Total points
1. Aman 30 12 10 30 82
2. Tom Atterton 12 35 15 17 79
3. Medhat 1 8 28 25 62
4. Daan 6 12 25 15 58
5. Varun 25 10 8 43
6. Arpad 10 15 15 40
7. Hossein 18 4 10 32
8. Joseph 25 6 31
9. Lee 8 4 10 6 28
10. Bram Kamies 10 10
11. Tim 6 6
12. Lars 2 2
Devin 2 2
14. Andre Muijen 1 1

March

Place Name Week 09 Week 10 Week 11 Week 12 Week 13 Total points
1. Lars 35 35 35 25 18 148
2. Aman 25 15 8 25 12 85
Hossein 15 15 20 12 23 85
4. Lee 25 8 25 6 12 76
5. Medhat 25 10 8 10 53
6. Varun 2 20 30 52
7. Daan 10 15 4 29
8. Josef 25 2 27
9. Tim 4 18 22
10. Luc 15 15
11. Peter-Paul 13 13
12. Joseph 4 4 4 12
13. Andre Muijen 6 4 1 11
14. Adjoa 6 4 10
15. Irene 8 8
16. Tom Atterton 6 6
17. Koodal 4 4
Amine 4 4

February

Place Name Week 05 Week 06 Week 07 Week 08 Total points
1. Aman 10 25 25 25 85
2. Lee 15 25 30 8 78
3. Lars 15 20 35 70
4. Varun 35 25 6 66
5. Hossein 2 30 25 57
6. Luc 30 25 55
7. Joseph 8 10 11 10 39
8. Anuradha 11 10 11 32
9. Daan 2 10 7 12 31
10. Koodal 1 25 26
11. Medhat 18 1 6 25
Irene 25 25
13. Ji 6 2 8
14. Adjoa 6 6
15. Patrick 5 5
Tim 5 5
17. Matthias 1 1