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Racket Track Management

This page provides the Exercism community with the information and tools needed to manage the Racket track.

Students
3,467
Submissions
29,629
Mentoring Discussions
655

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Practice Exercises

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Practice Exercises are exercises designed to allow students to solve an arbitrary problem, with the aim of them making use of the concepts they have learned so far.

Synced primary repo: ae0e96c581fa09578c0334ec75031d1ec3129152 (Updates should be instant)

Next goal: Implement 130 practice exercises. Find out more.
80 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
2,522
3,781 (avg. 1.5)
2,101 (83.3%)
3 (0.1%)
Acronym Acronym
343
950 (avg. 2.8)
164 (47.8%)
6 (1.7%)
Armstrong Numbers Armstrong Numbers
230
593 (avg. 2.6)
171 (74.3%)
7 (3.0%)
Atbash Cipher Atbash Cipher
98
377 (avg. 3.8)
61 (62.2%)
3 (3.1%)
Binary Search Binary Search
56
202 (avg. 3.6)
37 (66.1%)
4 (7.1%)
Bob Bob
306
1,443 (avg. 4.7)
232 (75.8%)
28 (9.2%)
Clock Clock
41
139 (avg. 3.4)
21 (51.2%)
2 (4.9%)
Collatz Conjecture Collatz Conjecture
289
1,090 (avg. 3.8)
236 (81.7%)
27 (9.3%)
D&D Character D&D Character
76
282 (avg. 3.7)
46 (60.5%)
1 (1.3%)
Darts Darts
57
126 (avg. 2.2)
44 (77.2%)
3 (5.3%)
Difference of Squares Difference of Squares
578
1,461 (avg. 2.5)
500 (86.5%)
56 (9.7%)
ETL ETL
138
315 (avg. 2.3)
104 (75.4%)
5 (3.6%)
Eliud's Eggs Eliud's Eggs
78
160 (avg. 2.1)
72 (92.3%)
0 (0.0%)
Gigasecond Gigasecond
331
524 (avg. 1.6)
279 (84.3%)
32 (9.7%)
Grains Grains
1,260
3,945 (avg. 3.1)
765 (60.7%)
148 (11.7%)
Grep Grep
102
248 (avg. 2.4)
57 (55.9%)
4 (3.9%)
Hamming Hamming
280
633 (avg. 2.3)
232 (82.9%)
24 (8.6%)
High Scores High Scores
26
52 (avg. 2.0)
15 (57.7%)
0 (0.0%)
Isogram Isogram
141
394 (avg. 2.8)
110 (78.0%)
5 (3.5%)
Leap Leap
687
1,567 (avg. 2.3)
609 (88.6%)
76 (11.1%)
List Ops List Ops
140
433 (avg. 3.1)
88 (62.9%)
6 (4.3%)
Nth Prime Nth Prime
12
47 (avg. 3.9)
9 (75.0%)
0 (0.0%)
Nucleotide Count Nucleotide Count
135
303 (avg. 2.2)
111 (82.2%)
5 (3.7%)
Pangram Pangram
30
55 (avg. 1.8)
24 (80.0%)
0 (0.0%)
Protein Translation Protein Translation
26
60 (avg. 2.3)
18 (69.2%)
0 (0.0%)
Proverb Proverb
21
52 (avg. 2.5)
16 (76.2%)
0 (0.0%)
Queen Attack Queen Attack
14
30 (avg. 2.1)
10 (71.4%)
0 (0.0%)
RNA Transcription RNA Transcription
159
223 (avg. 1.4)
141 (88.7%)
6 (3.8%)
Raindrops Raindrops
143
346 (avg. 2.4)
123 (86.0%)
8 (5.6%)
Resistor Color Resistor Color
30
82 (avg. 2.7)
25 (83.3%)
2 (6.7%)
Resistor Color Duo Resistor Color Duo
24
51 (avg. 2.1)
19 (79.2%)
1 (4.2%)
Resistor Color Trio Resistor Color Trio
27
180 (avg. 6.7)
20 (74.1%)
2 (7.4%)
Reverse String Reverse String
320
396 (avg. 1.2)
243 (75.9%)
4 (1.3%)
Roman Numerals Roman Numerals
147
272 (avg. 1.9)
117 (79.6%)
6 (4.1%)
Scrabble Score Scrabble Score
223
497 (avg. 2.2)
191 (85.7%)
22 (9.9%)
Sieve Sieve
22
55 (avg. 2.5)
17 (77.3%)
0 (0.0%)
Space Age Space Age
25
24 (avg. 1.0)
16 (64.0%)
0 (0.0%)
Square Root Square Root
31
47 (avg. 1.5)
21 (67.7%)
1 (3.2%)
Strain Strain
24
34 (avg. 1.4)
18 (75.0%)
1 (4.2%)
Triangle Triangle
47
180 (avg. 3.8)
35 (74.5%)
0 (0.0%)
Two Fer Two Fer
668
2,194 (avg. 3.3)
504 (75.4%)
97 (14.5%)
Affine Cipher Affine Cipher
91
403 (avg. 4.4)
52 (57.1%)
3 (3.3%)
All Your Base All Your Base
232
514 (avg. 2.2)
118 (50.9%)
3 (1.3%)
Allergies Allergies
95
138 (avg. 1.5)
73 (76.8%)
0 (0.0%)
Alphametics Alphametics
31
241 (avg. 7.8)
9 (29.0%)
4 (12.9%)
Anagram Anagram
150
296 (avg. 2.0)
126 (84.0%)
10 (6.7%)
Circular Buffer Circular Buffer
18
19 (avg. 1.1)
5 (27.8%)
0 (0.0%)
Diamond Diamond
8
19 (avg. 2.4)
4 (50.0%)
0 (0.0%)
Food Chain Food Chain
7
67 (avg. 9.6)
3 (42.9%)
0 (0.0%)
Grade School Grade School
10
8 (avg. 0.8)
4 (40.0%)
0 (0.0%)
House House
26
66 (avg. 2.5)
15 (57.7%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
7
7 (avg. 1.0)
2 (28.6%)
0 (0.0%)
Knapsack Knapsack
12
24 (avg. 2.0)
8 (66.7%)
0 (0.0%)
Largest Series Product Largest Series Product
11
16 (avg. 1.5)
5 (45.5%)
0 (0.0%)
Matching Brackets Matching Brackets
141
732 (avg. 5.2)
110 (78.0%)
2 (1.4%)
Meetup Meetup
93
166 (avg. 1.8)
49 (52.7%)
5 (5.4%)
Pascal's Triangle Pascal's Triangle
13
21 (avg. 1.6)
7 (53.8%)
0 (0.0%)
Perfect Numbers Perfect Numbers
388
1,132 (avg. 2.9)
329 (84.8%)
40 (10.3%)
Phone Number Phone Number
112
215 (avg. 1.9)
85 (75.9%)
1 (0.9%)
Pig Latin Pig Latin
7
10 (avg. 1.4)
3 (42.9%)
0 (0.0%)
Robot Name Robot Name
171
474 (avg. 2.8)
108 (63.2%)
3 (1.8%)
Robot Simulator Robot Simulator
9
15 (avg. 1.7)
4 (44.4%)
0 (0.0%)
Rotational Cipher Rotational Cipher
18
30 (avg. 1.7)
11 (61.1%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
9
30 (avg. 3.3)
5 (55.6%)
0 (0.0%)
Say Say
66
160 (avg. 2.4)
42 (63.6%)
0 (0.0%)
Secret Handshake Secret Handshake
8
7 (avg. 0.9)
4 (50.0%)
0 (0.0%)
Spiral Matrix Spiral Matrix
8
24 (avg. 3.0)
3 (37.5%)
0 (0.0%)
Sublist Sublist
33
69 (avg. 2.1)
19 (57.6%)
3 (9.1%)
Twelve Days Twelve Days
53
195 (avg. 3.7)
34 (64.2%)
2 (3.8%)
Two Bucket Two Bucket
9
27 (avg. 3.0)
4 (44.4%)
0 (0.0%)
Word Count Word Count
132
263 (avg. 2.0)
103 (78.0%)
4 (3.0%)
Yacht Yacht
10
40 (avg. 4.0)
5 (50.0%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
10
15 (avg. 1.5)
3 (30.0%)
0 (0.0%)
Bank Account Bank Account
14
35 (avg. 2.5)
3 (21.4%)
0 (0.0%)
Luhn Luhn
15
28 (avg. 1.9)
7 (46.7%)
0 (0.0%)
Minesweeper Minesweeper
13
28 (avg. 2.2)
4 (30.8%)
0 (0.0%)
Parallel Letter Frequency Parallel Letter Frequency
12
75 (avg. 6.3)
6 (50.0%)
0 (0.0%)
Variable Length Quantity Variable Length Quantity
56
171 (avg. 3.1)
23 (41.1%)
2 (3.6%)
Bowling Bowling
1
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
pythagorean-triplets pythagorean-triplets
3
0 (avg. 0.0)
0 (0.0%)
0 (0.0%)
1 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Accumulate Accumulate
5
6 (avg. 1.2)
3 (60.0%)
1 (20.0%)
50 unimplemented practice exercises
Binary Search Tree Binary Search Tree
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Book Store Book Store
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Bottle Song Bottle Song
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Change Change
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Complex Numbers Complex Numbers
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Connect Connect
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Conway's Game of Life Conway's Game of Life
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Crypto Square Crypto Square
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Custom Set Custom Set
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Dominoes Dominoes
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DOT DSL DOT DSL
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Error Handling Error Handling
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Flatten Array Flatten Array
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Forth Forth
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Go Counting Go Counting
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Hangman Hangman
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ISBN Verifier ISBN Verifier
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Killer Sudoku Helper Killer Sudoku Helper
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Ledger Ledger
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Lens Person Lens Person
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Linked List Linked List
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Markdown Markdown
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Matrix Matrix
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Micro Blog Micro Blog
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OCR Numbers OCR Numbers
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PaaS I/O PaaS I/O
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Palindrome Products Palindrome Products
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Poker Poker
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POV POV
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Prime Factors Prime Factors
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Pythagorean Triplet Pythagorean Triplet
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Rail Fence Cipher Rail Fence Cipher
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Rational Numbers Rational Numbers
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React React
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Rectangles Rectangles
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REST API REST API
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Saddle Points Saddle Points
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Satellite Satellite
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Series Series
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SGF Parsing SGF Parsing
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Simple Cipher Simple Cipher
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Simple Linked List Simple Linked List
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State of Tic-Tac-Toe State of Tic-Tac-Toe
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Sum of Multiples Sum of Multiples
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Tournament Tournament
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Transpose Transpose
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Tree Building Tree Building
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Word Search Word Search
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Wordy Wordy
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Zipper Zipper
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Programming Tags

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Help manage the tags used to group, filter and recommend solutions, approaches and articles.

0 tags

Test Runner

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Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Current version: 6ed2b5f4ae1fe185bc5413269e740868d986fcfd (Takes up to 10 mins to deploy)

Next goal: Get Test Runners to Version 2. Racket is currently utilising a Version 1 Test Runner. Find out more.
Total Test Runner Runs
28,063
Test Run Pass Rate
39.1% (10986)
Test Run Fail Rate
57.9% (16239)
Test Run Error Rate
3.0% (838)

Representer

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Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

Next goal: Build a Representer. Find out more.

Analyzer

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Build an Analyzer for Racket: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.