Erlang

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Exercises

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61 contributors

91 mentors

4,208
students have developed their Erlang skills on Exercism.

Students

4,208

Submissions

49,097

Mentoring Discussions

2,086

The Erlang track needs attention ⚠️

Building

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Use your knowledge to build the Erlang track itself

61 contributors

Build Test Runners

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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

39,800

Test Run Pass Rate

30.6% (12187)

Test Run Fail Rate

22.5% (8966)

Test Run Error Rate

46.9% (18647)

Build Analyzers

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

Next goal: Build an Analyzer. Find out more.

Build Representers

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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.

Create 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.

Next goal: Implement 127 practice exercises. Find out more.

Usage statistics

78 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

2,489

3,273 (avg. 1.3)

2,100 (84.4%)

9 (0.4%)

Two Fer

1,233

4,093 (avg. 3.3)

916 (74.3%)

267 (21.7%)

Leap

1,541

4,117 (avg. 2.7)

1,262 (81.9%)

317 (20.6%)

Accumulate

1,138

2,218 (avg. 1.9)

989 (86.9%)

214 (18.8%)

Collatz Conjecture

802

4,392 (avg. 5.5)

668 (83.3%)

163 (20.3%)

Raindrops

616

2,301 (avg. 3.7)

494 (80.2%)

151 (24.5%)

RNA Transcription

791

2,308 (avg. 2.9)

712 (90.0%)

144 (18.2%)

Bob

578

3,481 (avg. 6.0)

430 (74.4%)

92 (15.9%)

Strain

468

995 (avg. 2.1)

427 (91.2%)

78 (16.7%)

Hamming

459

2,252 (avg. 4.9)

409 (89.1%)

80 (17.4%)

Space Age

407

953 (avg. 2.3)

366 (89.9%)

62 (15.2%)

Darts

332

701 (avg. 2.1)

268 (80.7%)

21 (6.3%)

Queen Attack

271

546 (avg. 2.0)

222 (81.9%)

10 (3.7%)

Diamond

238

1,093 (avg. 4.6)

140 (58.8%)

16 (6.7%)

Difference of Squares

420

711 (avg. 1.7)

356 (84.8%)

42 (10.0%)

Series

286

710 (avg. 2.5)

231 (80.8%)

24 (8.4%)

Custom Set

233

738 (avg. 3.2)

141 (60.5%)

26 (11.2%)

Triangle

293

757 (avg. 2.6)

245 (83.6%)

20 (6.8%)

Prime Factors

150

345 (avg. 2.3)

114 (76.0%)

5 (3.3%)

Roman Numerals

164

263 (avg. 1.6)

115 (70.1%)

11 (6.7%)

Saddle Points

185 (avg. 1.9)

53 (55.2%)

6 (6.3%)

Complex Numbers

104

259 (avg. 2.5)

72 (69.2%)

4 (3.8%)

Rational Numbers

137 (avg. 1.9)

47 (65.3%)

1 (1.4%)

Beer Song

148

344 (avg. 2.3)

115 (77.7%)

8 (5.4%)

Anagram

258

505 (avg. 2.0)

215 (83.3%)

19 (7.4%)

Sieve

106

230 (avg. 2.2)

71 (67.0%)

10 (9.4%)

Change

213 (avg. 3.2)

31 (47.0%)

4 (6.1%)

Meetup

99 (avg. 1.3)

49 (66.2%)

0 (0.0%)

Palindrome Products

217 (avg. 3.6)

20 (32.8%)

1 (1.6%)

Minesweeper

75 (avg. 1.4)

27 (49.1%)

2 (3.6%)

Dominoes

99 (avg. 1.5)

26 (38.8%)

5 (7.5%)

Armstrong Numbers

132

812 (avg. 6.2)

100 (75.8%)

14 (10.6%)

Perfect Numbers

106

287 (avg. 2.7)

79 (74.5%)

12 (11.3%)

Sum of Multiples

248

373 (avg. 1.5)

215 (86.7%)

9 (3.6%)

Parallel Letter Frequency

118

159 (avg. 1.3)

64 (54.2%)

10 (8.5%)

Forth

27 (avg. 0.6)

19 (42.2%)

1 (2.2%)

Pascal's Triangle

88 (avg. 1.5)

35 (59.3%)

2 (3.4%)

Secret Handshake

141

436 (avg. 3.1)

91 (64.5%)

14 (9.9%)

Allergies

115

170 (avg. 1.5)

80 (69.6%)

7 (6.1%)

Bank Account

209 (avg. 2.2)

60 (63.2%)

2 (2.1%)

Poker

39 (avg. 1.0)

16 (40.0%)

0 (0.0%)

Connect

102 (avg. 2.7)

13 (34.2%)

1 (2.6%)

List Ops

341 (avg. 4.2)

50 (61.7%)

5 (6.2%)

Protein Translation

416 (avg. 4.7)

65 (73.9%)

6 (6.8%)

Scrabble Score

116

193 (avg. 1.7)

93 (80.2%)

3 (2.6%)

All Your Base

118 (avg. 1.5)

52 (65.8%)

7 (8.9%)

Spiral Matrix

49 (avg. 0.8)

22 (37.9%)

1 (1.7%)

Gigasecond

126

272 (avg. 2.2)

95 (75.4%)

3 (2.4%)

Grade School

120

142 (avg. 1.2)

96 (80.0%)

3 (2.5%)

Sublist

130 (avg. 2.2)

33 (56.9%)

2 (3.4%)

Largest Series Product

67 (avg. 1.0)

50 (75.8%)

2 (3.0%)

Satellite

15 (avg. 0.5)

11 (36.7%)

0 (0.0%)

Zipper

48 (avg. 0.7)

28 (41.8%)

0 (0.0%)

ISBN Verifier

429 (avg. 4.4)

70 (72.2%)

6 (6.2%)

Run-Length Encoding

452 (avg. 5.9)

42 (55.3%)

5 (6.6%)

Simple Linked List

177 (avg. 3.2)

31 (55.4%)

1 (1.8%)

Clock

136 (avg. 1.5)

73 (79.3%)

3 (3.3%)

Variable Length Quantity

45 (avg. 1.5)

13 (43.3%)

1 (3.3%)

Luhn

95 (avg. 1.3)

55 (73.3%)

6 (8.0%)

Pythagorean Triplet

122 (avg. 2.9)

20 (47.6%)

0 (0.0%)

Atbash Cipher

157

440 (avg. 2.8)

131 (83.4%)

9 (5.7%)

Nth Prime

61 (avg. 1.8)

18 (52.9%)

4 (11.8%)

Transpose

36 (avg. 0.8)

19 (44.2%)

1 (2.3%)

Word Count

129

203 (avg. 1.6)

92 (71.3%)

6 (4.7%)

ETL

86 (avg. 1.0)

70 (77.8%)

2 (2.2%)

Circular Buffer

259 (avg. 3.2)

56 (70.0%)

2 (2.5%)

Phone Number

149

415 (avg. 2.8)

122 (81.9%)

6 (4.0%)

Robot Simulator

153

408 (avg. 2.7)

112 (73.2%)

12 (7.8%)

Rotational Cipher

47 (avg. 0.9)

34 (61.8%)

2 (3.6%)

Crypto Square

29 (avg. 1.0)

14 (48.3%)

1 (3.4%)

Rail Fence Cipher

20 (avg. 0.6)

11 (35.5%)

0 (0.0%)

Book Store

27 (avg. 1.2)

7 (30.4%)

0 (0.0%)

Grains

312

554 (avg. 1.8)

272 (87.2%)

30 (9.6%)

Isogram

188

347 (avg. 1.8)

150 (79.8%)

24 (12.8%)

Nucleotide Count

273

464 (avg. 1.7)

220 (80.6%)

21 (7.7%)

Pangram

173

450 (avg. 2.6)

138 (79.8%)

22 (12.7%)

Matching Brackets

154

603 (avg. 3.9)

103 (66.9%)

14 (9.1%)

Resistor Color

89 (avg. 3.2)

19 (67.9%)

0 (0.0%)

49 unimplemented practice exercises

Acronym

Affine Cipher

Alphametics

Binary Search Tree

Bottle Song

Bowling

D&D Character

DOT DSL

Error Handling

Flatten Array

Food Chain

Go Counting

Grep

Hangman

High Scores

House

Killer Sudoku Helper

Kindergarten Garden

Knapsack

Ledger

Markdown

Matrix

Micro Blog

OCR Numbers

POV

PaaS I/O

Pig Latin

Proverb

REST API

React

Rectangles

Resistor Color Duo

Resistor Color Trio

Reverse String

Robot Name

SGF Parsing

Say

Scale Generator

Simple Cipher

Square Root

State of Tic-Tac-Toe

Tournament

Tree Building

Twelve Days

Two Bucket

Word Search

Wordy

Yacht

Zebra Puzzle

3 foregone practice exercises

Binary Search

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4,661

NobbZ

3,738

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3,655

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4,208 students have developed their Erlang skills on Exercism.

The Erlang track needs attention ⚠️

Build

Build Test Runners

Usage statistics

Build Analyzers

Build Representers

Create Practice Exercises

Usage statistics

We 💙 our volunteers

4,208
students have developed their Erlang skills on Exercism.