5,309
students have developed their Elm skills on Exercism.

Students
5,309
Submissions
107,952
Mentoring Discussions
2,143

The Elm track needs attention ⚠️

Building

Build

Use your knowledge to build the Elm track itself

Create the Elm syllabus

Learn More

Help create the track syllabus: is a set of concepts and learning exercises put together to teach foundational elements of the programming language.

Next goal: Create a complete syllabus with at least 20 concepts. Find out more.

Usage statistics

19 concepts being taught
Ba
Basics 1
928 learnt
Ba
Basics 2
754 learnt
Bo
Booleans
526 learnt
Li
Lists
550 learnt
Re
Records
416 learnt
Cu
Custom Types
458 learnt
Tu
Tuples
266 learnt
Ma
Maybe
318 learnt
Re
Result
150 learnt
Pa
Pattern Matching
135 learnt
Le
Let
366 learnt
Di
Dict
81 learnt
Pa
Parsing
34 learnt
Pa
Partial application and function composition
122 learnt
Co
Comparison
52 learnt
Se
Set
38 learnt
Ge
Generics
37 learnt
Op
Opaque Types
31 learnt
Ph
Phantom Types
16 learnt
19 active learning exercises
Started
Attempts
Completions
Mentoring requests
Lucian's Luscious Lasagna Lucian's Luscious Lasagna
1,060
3,912 (avg. 3.7)
928 (87.5%)
9 (0.8%)
Betty's Bike Shop Betty's Bike Shop
812
5,290 (avg. 6.5)
754 (92.9%)
4 (0.5%)
Annalyn's Infiltration Annalyn's Infiltration
579
4,584 (avg. 7.9)
526 (90.8%)
4 (0.7%)
Tracks on Tracks on Tracks Tracks on Tracks on Tracks
623
9,192 (avg. 14.8)
550 (88.3%)
12 (1.9%)
Bandwagoner Bandwagoner
460
3,652 (avg. 7.9)
416 (90.4%)
5 (1.1%)
Valentines Day Valentines Day
477
2,309 (avg. 4.8)
458 (96.0%)
1 (0.2%)
Tisbury Treasure Hunt Tisbury Treasure Hunt
311
4,157 (avg. 13.4)
266 (85.5%)
3 (1.0%)
Role Playing Game Role Playing Game
342
5,571 (avg. 16.3)
318 (93.0%)
2 (0.6%)
Go Go
195
1,832 (avg. 9.4)
150 (76.9%)
4 (2.1%)
Ticket, Please! Ticket, Please!
154
2,761 (avg. 17.9)
135 (87.7%)
2 (1.3%)
Mario's marvellous lasagna Mario's marvellous lasagna
388
1,383 (avg. 3.6)
366 (94.3%)
1 (0.3%)
Top Scorers Top Scorers
121
2,430 (avg. 20.1)
81 (66.9%)
1 (0.8%)
Paola's Prestigious Pizza Paola's Prestigious Pizza
48
1,423 (avg. 29.6)
34 (70.8%)
2 (4.2%)
Monster Attack Monster Attack
135
1,367 (avg. 10.1)
122 (90.4%)
1 (0.7%)
Blorkemon Cards Blorkemon Cards
61
827 (avg. 13.6)
52 (85.2%)
0 (0.0%)
Gotta Snatch'Em All Gotta Snatch'Em All
38
807 (avg. 21.2)
38 (100.0%)
0 (0.0%)
Treasure Chest Treasure Chest
38
322 (avg. 8.5)
37 (97.4%)
0 (0.0%)
Secure Treasure Chest Secure Treasure Chest
33
175 (avg. 5.3)
31 (93.9%)
0 (0.0%)
Treasure Factory Treasure Factory
23
399 (avg. 17.3)
16 (69.6%)
0 (0.0%)

Build Test Runners

Learn More

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

Usage statistics

Total Test Runner Runs
94,718
Test Run Pass Rate
18.2% (17229)
Test Run Fail Rate
29.9% (28283)
Test Run Error Rate
51.9% (49206)

Build Analyzers

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

Usage statistics

Total Analyzer Runs
10,415
Total Analysis Comments Made
3,233
Feedback Given Frequency
1.1%

Build Representers

Learn More

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

Usage statistics

Total Representer Runs
10,420
Total Representation Comments Made
0
Feedback Given Frequency
0.0%

Create Practice Exercises

Learn More

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.

Next goal: Implement 129 practice exercises. Find out more.

Usage statistics

53 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
3,842
4,842 (avg. 1.3)
3,417 (88.9%)
5 (0.1%)
Two Fer Two Fer
1,217
2,375 (avg. 2.0)
931 (76.5%)
559 (45.9%)
Bob Bob
1,723
5,211 (avg. 3.0)
1,361 (79.0%)
354 (20.5%)
Leap Leap
1,166
2,454 (avg. 2.1)
1,085 (93.1%)
177 (15.2%)
Space Age Space Age
664
1,258 (avg. 1.9)
605 (91.1%)
130 (19.6%)
Sum of Multiples Sum of Multiples
544
2,345 (avg. 4.3)
466 (85.7%)
101 (18.6%)
Accumulate Accumulate
700
1,289 (avg. 1.8)
656 (93.7%)
83 (11.9%)
Grade School Grade School
348
2,409 (avg. 6.9)
294 (84.5%)
75 (21.6%)
Raindrops Raindrops
763
1,934 (avg. 2.5)
733 (96.1%)
80 (10.5%)
Robot Simulator Robot Simulator
272
1,399 (avg. 5.1)
221 (81.3%)
37 (13.6%)
Allergies Allergies
247
930 (avg. 3.8)
199 (80.6%)
38 (15.4%)
Hamming Hamming
496
1,150 (avg. 2.3)
429 (86.5%)
20 (4.0%)
Pangram Pangram
755
1,822 (avg. 2.4)
692 (91.7%)
40 (5.3%)
Isogram Isogram
258
1,150 (avg. 4.5)
213 (82.6%)
12 (4.7%)
Phone Number Phone Number
314
1,190 (avg. 3.8)
232 (73.9%)
13 (4.1%)
Twelve Days Twelve Days
480
1,070 (avg. 2.2)
304 (63.3%)
92 (19.2%)
Acronym Acronym
187
533 (avg. 2.9)
148 (79.1%)
5 (2.7%)
Anagram Anagram
481
1,264 (avg. 2.6)
433 (90.0%)
31 (6.4%)
Series Series
226
1,025 (avg. 4.5)
189 (83.6%)
5 (2.2%)
Atbash Cipher Atbash Cipher
180
733 (avg. 4.1)
150 (83.3%)
3 (1.7%)
Luhn Luhn
155
795 (avg. 5.1)
106 (68.4%)
3 (1.9%)
Grains Grains
231
519 (avg. 2.2)
192 (83.1%)
3 (1.3%)
All Your Base All Your Base
141
664 (avg. 4.7)
92 (65.2%)
5 (3.5%)
Largest Series Product Largest Series Product
160
480 (avg. 3.0)
127 (79.4%)
2 (1.3%)
Triangle Triangle
530
1,121 (avg. 2.1)
498 (94.0%)
44 (8.3%)
Pythagorean Triplet Pythagorean Triplet
75
598 (avg. 8.0)
49 (65.3%)
1 (1.3%)
Collatz Conjecture Collatz Conjecture
271
465 (avg. 1.7)
210 (77.5%)
3 (1.1%)
Binary Search Binary Search
167
899 (avg. 5.4)
111 (66.5%)
7 (4.2%)
List Ops List Ops
210
710 (avg. 3.4)
174 (82.9%)
8 (3.8%)
Pascal's Triangle Pascal's Triangle
140
329 (avg. 2.4)
97 (69.3%)
3 (2.1%)
Roman Numerals Roman Numerals
133
290 (avg. 2.2)
104 (78.2%)
2 (1.5%)
ETL ETL
253
362 (avg. 1.4)
184 (72.7%)
3 (1.2%)
Nucleotide Count Nucleotide Count
284
455 (avg. 1.6)
241 (84.9%)
6 (2.1%)
Word Count Word Count
366
829 (avg. 2.3)
319 (87.2%)
12 (3.3%)
Strain Strain
415
618 (avg. 1.5)
368 (88.7%)
13 (3.1%)
Say Say
123
575 (avg. 4.7)
89 (72.4%)
2 (1.6%)
Wordy Wordy
54
473 (avg. 8.8)
38 (70.4%)
5 (9.3%)
Difference of Squares Difference of Squares
717
965 (avg. 1.3)
586 (81.7%)
20 (2.8%)
Gigasecond Gigasecond
420
555 (avg. 1.3)
315 (75.0%)
10 (2.4%)
RNA Transcription RNA Transcription
509
833 (avg. 1.6)
408 (80.2%)
19 (3.7%)
Armstrong Numbers Armstrong Numbers
116
329 (avg. 2.8)
93 (80.2%)
3 (2.6%)
Scrabble Score Scrabble Score
401
613 (avg. 1.5)
360 (89.8%)
32 (8.0%)
Run-Length Encoding Run-Length Encoding
268
828 (avg. 3.1)
215 (80.2%)
12 (4.5%)
Transpose Transpose
113
557 (avg. 4.9)
68 (60.2%)
2 (1.8%)
Matching Brackets Matching Brackets
122
364 (avg. 3.0)
85 (69.7%)
6 (4.9%)
Sublist Sublist
230
678 (avg. 2.9)
191 (83.0%)
6 (2.6%)
Bowling Bowling
24
452 (avg. 18.8)
10 (41.7%)
0 (0.0%)
Complex Numbers Complex Numbers
171
1,719 (avg. 10.1)
112 (65.5%)
3 (1.8%)
SGF Parsing SGF Parsing
6
166 (avg. 27.7)
4 (66.7%)
1 (16.7%)
Circular Buffer Circular Buffer
24
380 (avg. 15.8)
16 (66.7%)
1 (4.2%)
Custom Set Custom Set
14
167 (avg. 11.9)
10 (71.4%)
0 (0.0%)
Two Bucket Two Bucket
7
136 (avg. 19.4)
4 (57.1%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
23
252 (avg. 11.0)
4 (17.4%)
1 (4.3%)
76 unimplemented practice exercises
Affine Cipher Affine Cipher
Alphametics Alphametics
Bank Account Bank Account
Binary Search Tree Binary Search Tree
Book Store Book Store
Bottle Song Bottle Song
Change Change
Clock Clock
Connect Connect
Crypto Square Crypto Square
D&D Character D&D Character
DOT DSL DOT DSL
Darts Darts
Diamond Diamond
Dominoes Dominoes
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Go Counting Go Counting
Grep Grep
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
Markdown Markdown
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
Nth Prime Nth Prime
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Parallel Letter Frequency Parallel Letter Frequency
Perfect Numbers Perfect Numbers
Pig Latin Pig Latin
Poker Poker
Prime Factors Prime Factors
Protein Translation Protein Translation
Proverb Proverb
Queen Attack Queen Attack
REST API REST API
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Resistor Color Resistor Color
Resistor Color Duo Resistor Color Duo
Resistor Color Trio Resistor Color Trio
Reverse String Reverse String
Robot Name Robot Name
Rotational Cipher Rotational Cipher
Saddle Points Saddle Points
Satellite Satellite
Scale Generator Scale Generator
Secret Handshake Secret Handshake
Sieve Sieve
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Spiral Matrix Spiral Matrix
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Tournament Tournament
Tree Building Tree Building
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Yacht Yacht
Zipper Zipper