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50,022
students have developed their TypeScript skills on Exercism.

Students

50,022

Submissions

666,726

Mentoring Discussions

7,172

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Building

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Use your knowledge to build the TypeScript track itself

80 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.

Next goal: Get Test Runners to Version 2. TypeScript is currently utilising a Version 1 Test Runner. Find out more.

Usage statistics

Total Test Runner Runs

612,354

Test Run Pass Rate

19.3% (118147)

Test Run Fail Rate

39.3% (240597)

Test Run Error Rate

41.4% (253610)

Build Analyzers

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

Usage statistics

Total Analyzer Runs

94,927

Total Analysis Comments Made

8,308

Feedback Given Frequency

1.1%

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.

Usage statistics

Total Representer Runs

94,924

Total Representation Comments Made

23,288

Feedback Given Frequency

24.5%

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 131 practice exercises. Find out more.

Usage statistics

95 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

29,601

42,221 (avg. 1.4)

24,983 (84.4%)

6 (0.0%)

Two Fer

19,838

66,326 (avg. 3.3)

15,459 (77.9%)

1,469 (7.4%)

Resistor Color Duo

13,723

106,422 (avg. 7.8)

8,517 (62.1%)

1,107 (8.1%)

Resistor Color Trio

5,674

53,713 (avg. 9.5)

3,714 (65.5%)

191 (3.4%)

Leap

8,949

26,121 (avg. 2.9)

7,257 (81.1%)

1,371 (15.3%)

Resistor Color

4,676

18,529 (avg. 4.0)

3,886 (83.1%)

207 (4.4%)

RNA Transcription

5,901

34,798 (avg. 5.9)

4,702 (79.7%)

566 (9.6%)

Space Age

4,645

27,432 (avg. 5.9)

3,577 (77.0%)

305 (6.6%)

D&D Character

2,676

22,056 (avg. 8.2)

1,708 (63.8%)

87 (3.3%)

Pangram

3,879

16,522 (avg. 4.3)

3,021 (77.9%)

239 (6.2%)

Bob

3,493

25,639 (avg. 7.3)

2,305 (66.0%)

223 (6.4%)

Matrix

3,059

20,017 (avg. 6.5)

1,881 (61.5%)

164 (5.4%)

Robot Name

2,670

18,645 (avg. 7.0)

1,449 (54.3%)

151 (5.7%)

Grade School

1,799

18,754 (avg. 10.4)

1,083 (60.2%)

98 (5.4%)

Clock

1,342

10,176 (avg. 7.6)

862 (64.2%)

57 (4.2%)

Secret Handshake

1,023

4,649 (avg. 4.5)

744 (72.7%)

48 (4.7%)

Binary Search

1,164

5,592 (avg. 4.8)

806 (69.2%)

34 (2.9%)

Linked List

1,159

8,923 (avg. 7.7)

667 (57.5%)

57 (4.9%)

Rational Numbers

523

4,004 (avg. 7.7)

325 (62.1%)

18 (3.4%)

Atbash Cipher

571

4,118 (avg. 7.2)

438 (76.7%)

22 (3.9%)

Simple Cipher

1,084

3,457 (avg. 3.2)

533 (49.2%)

149 (13.7%)

Wordy

589

6,021 (avg. 10.2)

339 (57.6%)

16 (2.7%)

List Ops

730

4,742 (avg. 6.5)

270 (37.0%)

24 (3.3%)

Word Count

2,203

9,510 (avg. 4.3)

1,464 (66.5%)

81 (3.7%)

Difference of Squares

1,768

4,286 (avg. 2.4)

1,356 (76.7%)

70 (4.0%)

Gigasecond

2,072

3,960 (avg. 1.9)

1,447 (69.8%)

77 (3.7%)

Reverse String

1,893

3,426 (avg. 1.8)

1,605 (84.8%)

43 (2.3%)

Triangle

1,059

5,278 (avg. 5.0)

786 (74.2%)

32 (3.0%)

Collatz Conjecture

709

1,803 (avg. 2.5)

556 (78.4%)

17 (2.4%)

ETL

702

2,622 (avg. 3.7)

540 (76.9%)

15 (2.1%)

Protein Translation

759

4,247 (avg. 5.6)

567 (74.7%)

21 (2.8%)

Raindrops

800

2,298 (avg. 2.9)

669 (83.6%)

12 (1.5%)

Hamming

770

1,788 (avg. 2.3)

647 (84.0%)

8 (1.0%)

Nucleotide Count

550

1,999 (avg. 3.6)

414 (75.3%)

10 (1.8%)

Scrabble Score

629

2,756 (avg. 4.4)

480 (76.3%)

14 (2.2%)

Allergies

486

3,011 (avg. 6.2)

319 (65.6%)

13 (2.7%)

Perfect Numbers

548

1,883 (avg. 3.4)

432 (78.8%)

9 (1.6%)

Complex Numbers

296

1,017 (avg. 3.4)

196 (66.2%)

2 (0.7%)

Luhn

416

1,893 (avg. 4.6)

298 (71.6%)

11 (2.6%)

Grains

367

1,458 (avg. 4.0)

264 (71.9%)

4 (1.1%)

Pythagorean Triplet

335

1,045 (avg. 3.1)

184 (54.9%)

3 (0.9%)

Sum of Multiples

383

1,213 (avg. 3.2)

278 (72.6%)

7 (1.8%)

Acronym

622

4,175 (avg. 6.7)

443 (71.2%)

4 (0.6%)

Anagram

584

2,985 (avg. 5.1)

447 (76.5%)

9 (1.5%)

Isogram

584

1,949 (avg. 3.3)

483 (82.7%)

6 (1.0%)

Roman Numerals

478

1,523 (avg. 3.2)

330 (69.0%)

5 (1.0%)

Series

483

2,429 (avg. 5.0)

354 (73.3%)

7 (1.4%)

Phone Number

415

2,415 (avg. 5.8)

291 (70.1%)

3 (0.7%)

Two Bucket

246

594 (avg. 2.4)

98 (39.8%)

2 (0.8%)

Variable Length Quantity

176

511 (avg. 2.9)

78 (44.3%)

1 (0.6%)

Largest Series Product

238

1,170 (avg. 4.9)

157 (66.0%)

12 (5.0%)

Food Chain

206

687 (avg. 3.3)

121 (58.7%)

0 (0.0%)

House

194

665 (avg. 3.4)

101 (52.1%)

1 (0.5%)

ISBN Verifier

285

1,052 (avg. 3.7)

186 (65.3%)

3 (1.1%)

Pig Latin

209

776 (avg. 3.7)

113 (54.1%)

3 (1.4%)

Proverb

187

413 (avg. 2.2)

129 (69.0%)

1 (0.5%)

Twelve Days

235

750 (avg. 3.2)

142 (60.4%)

2 (0.9%)

Beer Song

237

1,113 (avg. 4.7)

158 (66.7%)

0 (0.0%)

Say

200

885 (avg. 4.4)

107 (53.5%)

0 (0.0%)

Rectangles

143

344 (avg. 2.4)

50 (35.0%)

0 (0.0%)

Saddle Points

180

515 (avg. 2.9)

103 (57.2%)

4 (2.2%)

Spiral Matrix

161

379 (avg. 2.4)

78 (48.4%)

2 (1.2%)

Transpose

215

1,480 (avg. 6.9)

111 (51.6%)

0 (0.0%)

OCR Numbers

143

703 (avg. 4.9)

73 (51.0%)

1 (0.7%)

Nth Prime

255

701 (avg. 2.7)

175 (68.6%)

1 (0.4%)

Alphametics

154

730 (avg. 4.7)

38 (24.7%)

1 (0.6%)

Connect

112

482 (avg. 4.3)

41 (36.6%)

1 (0.9%)

Bowling

316

2,844 (avg. 9.0)

97 (30.7%)

3 (0.9%)

Prime Factors

253

592 (avg. 2.3)

181 (71.5%)

10 (4.0%)

Diamond

148

632 (avg. 4.3)

80 (54.1%)

0 (0.0%)

Pascal's Triangle

174

521 (avg. 3.0)

100 (57.5%)

2 (1.1%)

Binary Search Tree

255

1,142 (avg. 4.5)

143 (56.1%)

3 (1.2%)

Sublist

179

998 (avg. 5.6)

100 (55.9%)

2 (1.1%)

Custom Set

185

1,216 (avg. 6.6)

92 (49.7%)

0 (0.0%)

Circular Buffer

323

1,224 (avg. 3.8)

177 (54.8%)

4 (1.2%)

Word Search

297

1,172 (avg. 3.9)

89 (30.0%)

4 (1.3%)

Sieve

139

353 (avg. 2.5)

87 (62.6%)

1 (0.7%)

Palindrome Products

146

818 (avg. 5.6)

57 (39.0%)

2 (1.4%)

Diffie-Hellman

433

1,218 (avg. 2.8)

275 (63.5%)

5 (1.2%)

Robot Simulator

252

1,493 (avg. 5.9)

124 (49.2%)

0 (0.0%)

Armstrong Numbers

1,054

2,661 (avg. 2.5)

785 (74.5%)

24 (2.3%)

Run-Length Encoding

858

3,022 (avg. 3.5)

526 (61.3%)

19 (2.2%)

Rotational Cipher

321

533 (avg. 1.7)

205 (63.9%)

9 (2.8%)

Strain

521

1,203 (avg. 2.3)

354 (67.9%)

16 (3.1%)

Accumulate

386

882 (avg. 2.3)

264 (68.4%)

11 (2.8%)

All Your Base

284

886 (avg. 3.1)

148 (52.1%)

4 (1.4%)

Flatten Array

458

1,436 (avg. 3.1)

292 (63.8%)

12 (2.6%)

Matching Brackets

446

1,778 (avg. 4.0)

252 (56.5%)

15 (3.4%)

Tournament

101

1,053 (avg. 10.4)

50 (49.5%)

2 (2.0%)

Minesweeper

325

1,070 (avg. 3.3)

156 (48.0%)

6 (1.8%)

Kindergarten Garden

150

412 (avg. 2.7)

84 (56.0%)

1 (0.7%)

Queen Attack

501

1,758 (avg. 3.5)

278 (55.5%)

18 (3.6%)

React

482

455 (avg. 0.9)

24 (5.0%)

0 (0.0%)

Crypto Square

247

662 (avg. 2.7)

121 (49.0%)

4 (1.6%)

Knapsack

218

896 (avg. 4.1)

56 (25.7%)

2 (0.9%)

36 unimplemented practice exercises

Affine Cipher

Bank Account

Book Store

Bottle Song

Change

DOT DSL

Darts

Dominoes

Error Handling

Forth

Go Counting

Grep

Hangman

High Scores

Killer Sudoku Helper

Ledger

Lens Person

Markdown

Meetup

Micro Blog

POV

PaaS I/O

Parallel Letter Frequency

Poker

REST API

Rail Fence Cipher

SGF Parsing

Satellite

Scale Generator

Simple Linked List

Square Root

State of Tic-Tac-Toe

Tree Building

Yacht

Zebra Puzzle

Zipper

Volunteers

341

ajoshguy

5,064

SleeplessByte

4,557

bobahop

4,466

+ 329 more

We 💙 our volunteers

Exercism relies on open-source volunteers to build our language tracks and mentor students.

Become an Exercism Volunteer

50,022 students have developed their TypeScript skills on Exercism.

The TypeScript track is healthy ✅

Build

Build Test Runners

Usage statistics

Build Analyzers

Usage statistics

Build Representers

Usage statistics

Create Practice Exercises

Usage statistics

We 💙 our volunteers

50,022
students have developed their TypeScript skills on Exercism.