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

• 2021

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