Erlang

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Exercises

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61 contributors

91 mentors

4,258
students have developed their Erlang skills on Exercism.

Students

4,258

Submissions

50,297

Mentoring Discussions

2,089

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

40,998

Test Run Pass Rate

30.5% (12487)

Test Run Fail Rate

22.7% (9308)

Test Run Error Rate

46.8% (19203)

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

2,529

3,358 (avg. 1.3)

2,134 (84.4%)

9 (0.4%)

Two Fer

1,255

4,241 (avg. 3.4)

935 (74.5%)

267 (21.3%)

Leap

1,558

4,148 (avg. 2.7)

1,271 (81.6%)

317 (20.3%)

Accumulate

1,150

2,266 (avg. 2.0)

997 (86.7%)

214 (18.6%)

Collatz Conjecture

810

4,460 (avg. 5.5)

677 (83.6%)

163 (20.1%)

Raindrops

625

2,321 (avg. 3.7)

500 (80.0%)

151 (24.2%)

RNA Transcription

797

2,315 (avg. 2.9)

715 (89.7%)

144 (18.1%)

Bob

583

3,516 (avg. 6.0)

434 (74.4%)

93 (16.0%)

Strain

474

1,010 (avg. 2.1)

433 (91.4%)

78 (16.5%)

Hamming

464

2,309 (avg. 5.0)

415 (89.4%)

80 (17.2%)

Space Age

410

992 (avg. 2.4)

370 (90.2%)

62 (15.1%)

Darts

336

705 (avg. 2.1)

271 (80.7%)

21 (6.3%)

Queen Attack

274

554 (avg. 2.0)

225 (82.1%)

10 (3.6%)

Diamond

241

1,113 (avg. 4.6)

144 (59.8%)

16 (6.6%)

Difference of Squares

428

733 (avg. 1.7)

364 (85.0%)

42 (9.8%)

Series

289

714 (avg. 2.5)

233 (80.6%)

24 (8.3%)

Custom Set

235

772 (avg. 3.3)

143 (60.9%)

26 (11.1%)

Triangle

298

802 (avg. 2.7)

251 (84.2%)

20 (6.7%)

Prime Factors

153

349 (avg. 2.3)

116 (75.8%)

5 (3.3%)

Roman Numerals

168

269 (avg. 1.6)

118 (70.2%)

11 (6.5%)

Saddle Points

100

189 (avg. 1.9)

54 (54.0%)

6 (6.0%)

Complex Numbers

107

271 (avg. 2.5)

73 (68.2%)

4 (3.7%)

Rational Numbers

138 (avg. 1.9)

48 (66.7%)

1 (1.4%)

Beer Song

148

344 (avg. 2.3)

115 (77.7%)

8 (5.4%)

Anagram

263

508 (avg. 1.9)

218 (82.9%)

19 (7.2%)

Sieve

108

232 (avg. 2.1)

73 (67.6%)

10 (9.3%)

Change

215 (avg. 3.2)

33 (49.3%)

4 (6.0%)

Meetup

100 (avg. 1.3)

50 (65.8%)

0 (0.0%)

Palindrome Products

217 (avg. 3.4)

20 (31.7%)

1 (1.6%)

Minesweeper

78 (avg. 1.4)

28 (49.1%)

2 (3.5%)

Dominoes

99 (avg. 1.5)

26 (38.2%)

5 (7.4%)

Armstrong Numbers

137

832 (avg. 6.1)

105 (76.6%)

15 (10.9%)

Perfect Numbers

109

301 (avg. 2.8)

82 (75.2%)

12 (11.0%)

Sum of Multiples

251

396 (avg. 1.6)

218 (86.9%)

9 (3.6%)

Parallel Letter Frequency

120

172 (avg. 1.4)

65 (54.2%)

10 (8.3%)

Forth

40 (avg. 0.9)

19 (40.4%)

1 (2.1%)

Pascal's Triangle

90 (avg. 1.5)

37 (60.7%)

2 (3.3%)

Secret Handshake

145

453 (avg. 3.1)

93 (64.1%)

14 (9.7%)

Allergies

117

214 (avg. 1.8)

83 (70.9%)

7 (6.0%)

Bank Account

216 (avg. 2.2)

62 (63.3%)

2 (2.0%)

Poker

103 (avg. 2.5)

17 (40.5%)

0 (0.0%)

Connect

102 (avg. 2.7)

13 (34.2%)

1 (2.6%)

List Ops

366 (avg. 4.3)

54 (62.8%)

5 (5.8%)

Protein Translation

430 (avg. 4.7)

69 (75.0%)

6 (6.5%)

Scrabble Score

118

204 (avg. 1.7)

96 (81.4%)

3 (2.5%)

All Your Base

119 (avg. 1.5)

53 (65.4%)

7 (8.6%)

Spiral Matrix

50 (avg. 0.8)

22 (37.3%)

1 (1.7%)

Gigasecond

130

288 (avg. 2.2)

99 (76.2%)

3 (2.3%)

Grade School

127

148 (avg. 1.2)

100 (78.7%)

3 (2.4%)

Sublist

132 (avg. 2.2)

35 (58.3%)

2 (3.3%)

Largest Series Product

68 (avg. 1.0)

51 (73.9%)

2 (2.9%)

Satellite

19 (avg. 0.6)

12 (38.7%)

0 (0.0%)

Zipper

48 (avg. 0.7)

28 (41.8%)

0 (0.0%)

ISBN Verifier

100

435 (avg. 4.4)

73 (73.0%)

6 (6.0%)

Run-Length Encoding

456 (avg. 5.7)

45 (56.3%)

5 (6.3%)

Simple Linked List

207 (avg. 3.4)

35 (57.4%)

1 (1.6%)

Clock

137 (avg. 1.5)

74 (79.6%)

3 (3.2%)

Variable Length Quantity

45 (avg. 1.5)

13 (43.3%)

1 (3.3%)

Luhn

98 (avg. 1.3)

56 (71.8%)

6 (7.7%)

Pythagorean Triplet

122 (avg. 2.9)

20 (47.6%)

0 (0.0%)

Atbash Cipher

160

463 (avg. 2.9)

134 (83.8%)

10 (6.3%)

Nth Prime

62 (avg. 1.8)

19 (54.3%)

5 (14.3%)

Transpose

36 (avg. 0.8)

19 (44.2%)

1 (2.3%)

Word Count

130

204 (avg. 1.6)

93 (71.5%)

6 (4.6%)

ETL

88 (avg. 1.0)

70 (76.9%)

3 (3.3%)

Circular Buffer

260 (avg. 3.2)

57 (70.4%)

2 (2.5%)

Phone Number

152

425 (avg. 2.8)

125 (82.2%)

6 (3.9%)

Robot Simulator

154

409 (avg. 2.7)

113 (73.4%)

12 (7.8%)

Rotational Cipher

49 (avg. 0.9)

36 (63.2%)

2 (3.5%)

Crypto Square

59 (avg. 1.8)

15 (46.9%)

1 (3.1%)

Rail Fence Cipher

20 (avg. 0.6)

11 (35.5%)

0 (0.0%)

Book Store

27 (avg. 1.1)

7 (29.2%)

0 (0.0%)

Grains

316

561 (avg. 1.8)

275 (87.0%)

30 (9.5%)

Isogram

194

361 (avg. 1.9)

153 (78.9%)

24 (12.4%)

Nucleotide Count

275

471 (avg. 1.7)

222 (80.7%)

21 (7.6%)

Pangram

176

459 (avg. 2.6)

139 (79.0%)

22 (12.5%)

Matching Brackets

156

612 (avg. 3.9)

105 (67.3%)

14 (9.0%)

Resistor Color

102 (avg. 3.3)

22 (71.0%)

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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125

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4,661

NobbZ

3,738

elbrujohalcon

3,660

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4,258 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

4,258
students have developed their Erlang skills on Exercism.