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Exercises

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51,232
students have developed their TypeScript skills on Exercism.

Students

51,232

Submissions

697,661

Mentoring Discussions

7,221

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Building

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Use your knowledge to build the TypeScript track itself

82 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

643,201

Test Run Pass Rate

19.1% (123161)

Test Run Fail Rate

39.5% (253892)

Test Run Error Rate

41.4% (266148)

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

98,943

Total Analysis Comments Made

8,776

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

98,940

Total Representation Comments Made

24,323

Feedback Given Frequency

24.6%

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 130 practice exercises. Find out more.

Usage statistics

95 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

30,547

43,755 (avg. 1.4)

25,818 (84.5%)

6 (0.0%)

Two Fer

20,528

69,165 (avg. 3.4)

15,940 (77.7%)

1,482 (7.2%)

Resistor Color Duo

14,207

110,777 (avg. 7.8)

8,812 (62.0%)

1,126 (7.9%)

Resistor Color Trio

5,953

57,184 (avg. 9.6)

3,874 (65.1%)

196 (3.3%)

Leap

9,141

27,019 (avg. 3.0)

7,426 (81.2%)

1,371 (15.0%)

Resistor Color

4,838

19,373 (avg. 4.0)

4,018 (83.1%)

208 (4.3%)

RNA Transcription

6,046

36,159 (avg. 6.0)

4,822 (79.8%)

569 (9.4%)

Space Age

4,787

28,849 (avg. 6.0)

3,689 (77.1%)

307 (6.4%)

D&D Character

2,782

23,118 (avg. 8.3)

1,775 (63.8%)

90 (3.2%)

Darts

129

528 (avg. 4.1)

93 (72.1%)

0 (0.0%)

Pangram

3,964

17,041 (avg. 4.3)

3,096 (78.1%)

241 (6.1%)

Bob

3,581

26,837 (avg. 7.5)

2,367 (66.1%)

224 (6.3%)

Matrix

3,132

20,904 (avg. 6.7)

1,937 (61.8%)

165 (5.3%)

Robot Name

2,736

19,306 (avg. 7.1)

1,489 (54.4%)

153 (5.6%)

Grade School

1,839

19,832 (avg. 10.8)

1,109 (60.3%)

99 (5.4%)

Clock

1,370

10,502 (avg. 7.7)

885 (64.6%)

57 (4.2%)

Secret Handshake

1,045

4,820 (avg. 4.6)

763 (73.0%)

49 (4.7%)

Binary Search

1,189

5,862 (avg. 4.9)

828 (69.6%)

35 (2.9%)

Linked List

1,181

9,457 (avg. 8.0)

676 (57.2%)

58 (4.9%)

Rational Numbers

529

4,151 (avg. 7.8)

330 (62.4%)

18 (3.4%)

Atbash Cipher

582

4,323 (avg. 7.4)

445 (76.5%)

22 (3.8%)

Simple Cipher

1,094

3,534 (avg. 3.2)

538 (49.2%)

149 (13.6%)

Wordy

600

6,089 (avg. 10.1)

344 (57.3%)

16 (2.7%)

List Ops

736

5,093 (avg. 6.9)

275 (37.4%)

24 (3.3%)

Word Count

2,230

9,924 (avg. 4.5)

1,476 (66.2%)

81 (3.6%)

Difference of Squares

1,786

4,429 (avg. 2.5)

1,371 (76.8%)

70 (3.9%)

Gigasecond

2,084

4,003 (avg. 1.9)

1,454 (69.8%)

77 (3.7%)

Reverse String

1,918

3,532 (avg. 1.8)

1,627 (84.8%)

43 (2.2%)

Triangle

1,073

5,439 (avg. 5.1)

796 (74.2%)

32 (3.0%)

Collatz Conjecture

719

1,945 (avg. 2.7)

564 (78.4%)

17 (2.4%)

ETL

722

2,783 (avg. 3.9)

551 (76.3%)

15 (2.1%)

Protein Translation

770

4,415 (avg. 5.7)

578 (75.1%)

21 (2.7%)

Raindrops

821

2,373 (avg. 2.9)

688 (83.8%)

12 (1.5%)

Hamming

784

1,835 (avg. 2.3)

660 (84.2%)

9 (1.1%)

Nucleotide Count

560

2,071 (avg. 3.7)

421 (75.2%)

10 (1.8%)

Scrabble Score

641

2,851 (avg. 4.4)

491 (76.6%)

14 (2.2%)

Allergies

492

3,031 (avg. 6.2)

321 (65.2%)

13 (2.6%)

Perfect Numbers

554

1,915 (avg. 3.5)

437 (78.9%)

9 (1.6%)

Complex Numbers

300

1,021 (avg. 3.4)

200 (66.7%)

2 (0.7%)

Luhn

423

2,002 (avg. 4.7)

303 (71.6%)

11 (2.6%)

Grains

375

1,557 (avg. 4.2)

271 (72.3%)

4 (1.1%)

Pythagorean Triplet

341

1,098 (avg. 3.2)

189 (55.4%)

3 (0.9%)

Sum of Multiples

391

1,295 (avg. 3.3)

282 (72.1%)

7 (1.8%)

Acronym

640

4,492 (avg. 7.0)

456 (71.3%)

5 (0.8%)

Anagram

598

3,166 (avg. 5.3)

459 (76.8%)

9 (1.5%)

Isogram

590

1,990 (avg. 3.4)

487 (82.5%)

6 (1.0%)

Roman Numerals

490

1,559 (avg. 3.2)

339 (69.2%)

5 (1.0%)

Series

492

2,527 (avg. 5.1)

362 (73.6%)

7 (1.4%)

Phone Number

426

2,520 (avg. 5.9)

295 (69.2%)

3 (0.7%)

Two Bucket

251

641 (avg. 2.6)

100 (39.8%)

2 (0.8%)

Variable Length Quantity

178

532 (avg. 3.0)

79 (44.4%)

1 (0.6%)

Largest Series Product

240

1,192 (avg. 5.0)

159 (66.3%)

12 (5.0%)

Food Chain

211

739 (avg. 3.5)

124 (58.8%)

0 (0.0%)

House

195

679 (avg. 3.5)

102 (52.3%)

1 (0.5%)

ISBN Verifier

287

1,089 (avg. 3.8)

188 (65.5%)

3 (1.0%)

Pig Latin

212

978 (avg. 4.6)

116 (54.7%)

3 (1.4%)

Proverb

189

445 (avg. 2.4)

131 (69.3%)

1 (0.5%)

Twelve Days

236

781 (avg. 3.3)

144 (61.0%)

2 (0.8%)

Beer Song

239

1,148 (avg. 4.8)

159 (66.5%)

0 (0.0%)

Say

204

1,076 (avg. 5.3)

110 (53.9%)

0 (0.0%)

Rectangles

148

410 (avg. 2.8)

52 (35.1%)

0 (0.0%)

Saddle Points

183

549 (avg. 3.0)

106 (57.9%)

4 (2.2%)

Spiral Matrix

166

428 (avg. 2.6)

82 (49.4%)

2 (1.2%)

Transpose

220

1,657 (avg. 7.5)

115 (52.3%)

0 (0.0%)

OCR Numbers

147

927 (avg. 6.3)

76 (51.7%)

1 (0.7%)

Nth Prime

257

742 (avg. 2.9)

177 (68.9%)

1 (0.4%)

Alphametics

157

740 (avg. 4.7)

39 (24.8%)

1 (0.6%)

Connect

114

482 (avg. 4.2)

41 (36.0%)

1 (0.9%)

Bowling

325

3,094 (avg. 9.5)

98 (30.2%)

4 (1.2%)

Prime Factors

255

604 (avg. 2.4)

183 (71.8%)

10 (3.9%)

Diamond

149

665 (avg. 4.5)

81 (54.4%)

0 (0.0%)

Pascal's Triangle

176

527 (avg. 3.0)

101 (57.4%)

2 (1.1%)

Binary Search Tree

260

1,207 (avg. 4.6)

147 (56.5%)

3 (1.2%)

Sublist

182

1,023 (avg. 5.6)

103 (56.6%)

2 (1.1%)

Custom Set

187

1,251 (avg. 6.7)

94 (50.3%)

0 (0.0%)

Circular Buffer

327

1,294 (avg. 4.0)

180 (55.0%)

4 (1.2%)

Word Search

302

1,308 (avg. 4.3)

90 (29.8%)

4 (1.3%)

Sieve

142

380 (avg. 2.7)

89 (62.7%)

1 (0.7%)

Palindrome Products

150

1,001 (avg. 6.7)

58 (38.7%)

2 (1.3%)

Diffie-Hellman

440

1,254 (avg. 2.9)

281 (63.9%)

5 (1.1%)

Robot Simulator

257

1,629 (avg. 6.3)

127 (49.4%)

0 (0.0%)

Armstrong Numbers

1,066

2,905 (avg. 2.7)

793 (74.4%)

24 (2.3%)

Run-Length Encoding

869

3,269 (avg. 3.8)

533 (61.3%)

20 (2.3%)

Rotational Cipher

322

543 (avg. 1.7)

206 (64.0%)

9 (2.8%)

Strain

525

1,212 (avg. 2.3)

357 (68.0%)

16 (3.0%)

All Your Base

287

924 (avg. 3.2)

151 (52.6%)

4 (1.4%)

Flatten Array

464

1,497 (avg. 3.2)

298 (64.2%)

12 (2.6%)

Matching Brackets

451

1,879 (avg. 4.2)

256 (56.8%)

15 (3.3%)

Tournament

107

1,146 (avg. 10.7)

50 (46.7%)

2 (1.9%)

Minesweeper

329

1,077 (avg. 3.3)

159 (48.3%)

6 (1.8%)

Kindergarten Garden

154

506 (avg. 3.3)

88 (57.1%)

1 (0.6%)

Queen Attack

507

1,844 (avg. 3.6)

281 (55.4%)

18 (3.6%)

React

492

467 (avg. 0.9)

24 (4.9%)

0 (0.0%)

Crypto Square

247

663 (avg. 2.7)

122 (49.4%)

4 (1.6%)

Knapsack

221

924 (avg. 4.2)

59 (26.7%)

2 (0.9%)

1 deprecated practice exercises

Started

Attempts

Completions

Mentoring requests

Accumulate

386

882 (avg. 2.3)

264 (68.4%)

11 (2.8%)

35 unimplemented practice exercises

Affine Cipher

Bank Account

Book Store

Bottle Song

Change

DOT DSL

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

342

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5,069

SleeplessByte

4,706

bobahop

4,581

+ 330 more

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Become an Exercism Volunteer

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Mentoring

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Insiders

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51,232 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

51,232
students have developed their TypeScript skills on Exercism.