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Factor
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Factor Track Management

This page provides the Exercism community with the information and tools needed to manage the Factor track.

Students
97
Submissions
8,219
Mentoring Discussions
2

The Factor track needs attention ⚠️

Building

Factor syllabus

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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 50 concepts. Find out more.
47 concepts being taught
Ba
Basics
38 learnt
Wo
Words
32 learnt
Bo
Booleans
26 learnt
Nu
Numbers
26 learnt
Co
Conditionals
24 learnt
St
Strings
21 learnt
Un
Unicode
17 learnt
Qu
Quotations
19 learnt
Co
Combinators
19 learnt
Bi
Bitwise Operations
18 learnt
Ta
Tabulation
17 learnt
Se
Sequences
17 learnt
Ar
Arrays
16 learnt
Hi
Higher-Order Sequences
16 learnt
Mu
Mutation
15 learnt
Re
Reductions
15 learnt
Cu
Curry, Compose, and Fry
16 learnt
Di
Disjoint Sets
13 learnt
Re
Regular Expressions
14 learnt
Ad
Advanced Regular Expressions
12 learnt
In
Indexed Iteration
11 learnt
Wi
Windows
14 learnt
Tu
Tuples
11 learnt
Er
Errors
9 learnt
Vo
Vocabularies
13 learnt
As
Assocs
12 learnt
He
Heaps
9 learnt
Qu
Quotations and Call
7 learnt
Re
Recursion
13 learnt
Ca
Case
11 learnt
Lo
Locals
11 learnt
Wh
While
8 learnt
Dy
Dynamic Variables
7 learnt
Ra
Randomness
12 learnt
Ca
Calendar
10 learnt
Ge
Generics
8 learnt
Ha
Hash Sets
6 learnt
De
Deques
6 learnt
Co
Concurrency
6 learnt
Wi
Wire Format
8 learnt
Su
Subclasses
6 learnt
Ma
Macros
8 learnt
De
Destructors
6 learnt
IO
IO Streams
6 learnt
St
Streams
5 learnt
Co
Combinatorics
7 learnt
Fi
Files
5 learnt
47 active learning exercises
Started
Attempts
Completions
Mentoring requests
Cargo Shuffle Cargo Shuffle
41
142 (avg. 3.5)
38 (92.7%)
0 (0.0%)
Leah's Luscious Lasagna Leah's Luscious Lasagna
36
167 (avg. 4.6)
32 (88.9%)
0 (0.0%)
Annalyn's Infiltration Annalyn's Infiltration
29
163 (avg. 5.6)
26 (89.7%)
0 (0.0%)
Currency Conversion Currency Conversion
27
312 (avg. 11.6)
26 (96.3%)
1 (3.7%)
Cars, Assemble! Cars, Assemble!
24
187 (avg. 7.8)
24 (100.0%)
0 (0.0%)
Log Levels Log Levels
21
177 (avg. 8.4)
21 (100.0%)
0 (0.0%)
Character Study Character Study
17
206 (avg. 12.1)
17 (100.0%)
0 (0.0%)
High School Sweetheart High School Sweetheart
20
166 (avg. 8.3)
19 (95.0%)
0 (0.0%)
Joiner's Journey Joiner's Journey
19
160 (avg. 8.4)
19 (100.0%)
0 (0.0%)
Secrets Secrets
18
151 (avg. 8.4)
18 (100.0%)
0 (0.0%)
Bunting Bonanza Bunting Bonanza
17
205 (avg. 12.1)
17 (100.0%)
0 (0.0%)
Backyard Birdwatcher Backyard Birdwatcher
17
113 (avg. 6.6)
17 (100.0%)
0 (0.0%)
Mosaic Making Mosaic Making
16
64 (avg. 4.0)
16 (100.0%)
0 (0.0%)
Boutique Bookkeeping Boutique Bookkeeping
16
164 (avg. 10.3)
16 (100.0%)
0 (0.0%)
Mosaic Mischief Mosaic Mischief
15
108 (avg. 7.2)
15 (100.0%)
0 (0.0%)
Librarian's Ledger Librarian's Ledger
15
127 (avg. 8.5)
15 (100.0%)
0 (0.0%)
Coordinate Choreography Coordinate Choreography
16
189 (avg. 11.8)
16 (100.0%)
0 (0.0%)
Poetry Club Poetry Club
13
83 (avg. 6.4)
13 (100.0%)
0 (0.0%)
Passphrase Patrol Passphrase Patrol
14
81 (avg. 5.8)
14 (100.0%)
0 (0.0%)
Ledger Lookout Ledger Lookout
13
73 (avg. 5.6)
12 (92.3%)
0 (0.0%)
Lap Leaderboard Lap Leaderboard
13
155 (avg. 11.9)
11 (84.6%)
0 (0.0%)
Belgian Boxcars Belgian Boxcars
14
89 (avg. 6.4)
14 (100.0%)
0 (0.0%)
Role Playing Game Role Playing Game
11
106 (avg. 9.6)
11 (100.0%)
0 (0.0%)
Factory Failsafe Factory Failsafe
9
108 (avg. 12.0)
9 (100.0%)
0 (0.0%)
Bosun's Briefing Bosun's Briefing
13
86 (avg. 6.6)
13 (100.0%)
0 (0.0%)
Purser's Pantry Purser's Pantry
12
226 (avg. 18.8)
12 (100.0%)
0 (0.0%)
Tellers' Triage Tellers' Triage
9
55 (avg. 6.1)
9 (100.0%)
0 (0.0%)
RPN Calculator RPN Calculator
7
72 (avg. 10.3)
7 (100.0%)
0 (0.0%)
Backyard Birdcount Backyard Birdcount
13
153 (avg. 11.8)
13 (100.0%)
0 (0.0%)
Valentine's Day Valentine's Day
11
167 (avg. 15.2)
11 (100.0%)
1 (9.1%)
Lasagna Luminary Lasagna Luminary
11
92 (avg. 8.4)
11 (100.0%)
0 (0.0%)
Mixed Juices Mixed Juices
8
94 (avg. 11.8)
8 (100.0%)
0 (0.0%)
Garden Gathering Garden Gathering
7
48 (avg. 6.9)
7 (100.0%)
0 (0.0%)
Boardwalk Games Boardwalk Games
13
77 (avg. 5.9)
12 (92.3%)
0 (0.0%)
Ferry Schedule Ferry Schedule
10
53 (avg. 5.3)
10 (100.0%)
0 (0.0%)
Bering Bearings Bering Bearings
8
72 (avg. 9.0)
8 (100.0%)
0 (0.0%)
Lighthouse Logbook Lighthouse Logbook
7
36 (avg. 5.1)
6 (85.7%)
0 (0.0%)
Pirates' Path Pirates' Path
6
107 (avg. 17.8)
6 (100.0%)
0 (0.0%)
Quayside Crew Quayside Crew
6
47 (avg. 7.8)
6 (100.0%)
0 (0.0%)
Signaler's Satchel Signaler's Satchel
8
37 (avg. 4.6)
8 (100.0%)
0 (0.0%)
Dragons' Descendants Dragons' Descendants
6
30 (avg. 5.0)
6 (100.0%)
0 (0.0%)
Signal Stencils Signal Stencils
8
33 (avg. 4.1)
8 (100.0%)
0 (0.0%)
Boatswain's Bilge Boatswain's Bilge
6
52 (avg. 8.7)
6 (100.0%)
0 (0.0%)
Channel Chatter Channel Chatter
6
33 (avg. 5.5)
6 (100.0%)
0 (0.0%)
Telegrapher's Tape Telegrapher's Tape
5
18 (avg. 3.6)
5 (100.0%)
0 (0.0%)
Mixtape Maker Mixtape Maker
7
23 (avg. 3.3)
7 (100.0%)
0 (0.0%)
Vltava Weather Watch Vltava Weather Watch
5
12 (avg. 2.4)
5 (100.0%)
0 (0.0%)

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.

Synced primary repo: 9c6401623a66383bd34f7cbce5c21a1198dd92c6 (Updates should be instant)

Next goal: Implement 138 practice exercises. Find out more.
116 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
83
129 (avg. 1.6)
60 (72.3%)
0 (0.0%)
Collatz Conjecture Collatz Conjecture
7
16 (avg. 2.3)
7 (100.0%)
0 (0.0%)
Darts Darts
15
64 (avg. 4.3)
14 (93.3%)
1 (6.7%)
Difference of Squares Difference of Squares
11
65 (avg. 5.9)
11 (100.0%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
10
36 (avg. 3.6)
10 (100.0%)
0 (0.0%)
ETL ETL
7
35 (avg. 5.0)
7 (100.0%)
0 (0.0%)
Grains Grains
8
25 (avg. 3.1)
8 (100.0%)
0 (0.0%)
High Scores High Scores
7
21 (avg. 3.0)
6 (85.7%)
0 (0.0%)
Micro Blog Micro Blog
10
33 (avg. 3.3)
10 (100.0%)
0 (0.0%)
Nucleotide Count Nucleotide Count
7
34 (avg. 4.9)
6 (85.7%)
0 (0.0%)
Pangram Pangram
8
31 (avg. 3.9)
8 (100.0%)
0 (0.0%)
Resistor Color Resistor Color
8
17 (avg. 2.1)
8 (100.0%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
6
13 (avg. 2.2)
6 (100.0%)
0 (0.0%)
Resistor Color Trio Resistor Color Trio
5
20 (avg. 4.0)
4 (80.0%)
0 (0.0%)
RNA Transcription RNA Transcription
6
12 (avg. 2.0)
6 (100.0%)
0 (0.0%)
Triangle Triangle
5
34 (avg. 6.8)
5 (100.0%)
0 (0.0%)
Two Fer Two Fer
14
26 (avg. 1.9)
12 (85.7%)
0 (0.0%)
Acronym Acronym
4
10 (avg. 2.5)
4 (100.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
5
16 (avg. 3.2)
5 (100.0%)
0 (0.0%)
Binary Search Binary Search
5
52 (avg. 10.4)
5 (100.0%)
0 (0.0%)
Bob Bob
4
4 (avg. 1.0)
4 (100.0%)
0 (0.0%)
Hamming Hamming
7
25 (avg. 3.6)
7 (100.0%)
0 (0.0%)
ISBN Verifier ISBN Verifier
6
76 (avg. 12.7)
6 (100.0%)
0 (0.0%)
Isogram Isogram
9
28 (avg. 3.1)
8 (88.9%)
0 (0.0%)
Leap Leap
19
58 (avg. 3.1)
17 (89.5%)
1 (5.3%)
Line Up Line Up
6
29 (avg. 4.8)
6 (100.0%)
0 (0.0%)
Phone Number Phone Number
5
27 (avg. 5.4)
5 (100.0%)
0 (0.0%)
Prime Factors Prime Factors
7
20 (avg. 2.9)
7 (100.0%)
0 (0.0%)
Queen Attack Queen Attack
6
25 (avg. 4.2)
6 (100.0%)
0 (0.0%)
Raindrops Raindrops
9
46 (avg. 5.1)
9 (100.0%)
0 (0.0%)
Reverse String Reverse String
7
11 (avg. 1.6)
7 (100.0%)
0 (0.0%)
Rotational Cipher Rotational Cipher
6
20 (avg. 3.3)
6 (100.0%)
0 (0.0%)
Scrabble Score Scrabble Score
5
36 (avg. 7.2)
5 (100.0%)
0 (0.0%)
Series Series
7
41 (avg. 5.9)
6 (85.7%)
0 (0.0%)
Sublist Sublist
6
26 (avg. 4.3)
6 (100.0%)
0 (0.0%)
Sum of Multiples Sum of Multiples
7
29 (avg. 4.1)
6 (85.7%)
0 (0.0%)
Allergies Allergies
6
24 (avg. 4.0)
6 (100.0%)
0 (0.0%)
Armstrong Numbers Armstrong Numbers
6
20 (avg. 3.3)
6 (100.0%)
0 (0.0%)
Bottle Song Bottle Song
5
34 (avg. 6.8)
5 (100.0%)
0 (0.0%)
Complex Numbers Complex Numbers
7
94 (avg. 13.4)
7 (100.0%)
0 (0.0%)
D&D Character D&D Character
6
46 (avg. 7.7)
6 (100.0%)
0 (0.0%)
Diamond Diamond
4
11 (avg. 2.8)
4 (100.0%)
0 (0.0%)
Flatten Array Flatten Array
9
56 (avg. 6.2)
9 (100.0%)
0 (0.0%)
Grade School Grade School
5
17 (avg. 3.4)
4 (80.0%)
0 (0.0%)
House House
4
10 (avg. 2.5)
4 (100.0%)
0 (0.0%)
Kindergarten Garden Kindergarten Garden
7
62 (avg. 8.9)
6 (85.7%)
0 (0.0%)
Largest Series Product Largest Series Product
7
46 (avg. 6.6)
5 (71.4%)
0 (0.0%)
Luhn Luhn
7
74 (avg. 10.6)
7 (100.0%)
0 (0.0%)
Matrix Matrix
6
30 (avg. 5.0)
5 (83.3%)
0 (0.0%)
Meetup Meetup
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
Pascal's Triangle Pascal's Triangle
5
7 (avg. 1.4)
4 (80.0%)
0 (0.0%)
Protein Translation Protein Translation
5
40 (avg. 8.0)
5 (100.0%)
0 (0.0%)
Proverb Proverb
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Rational Numbers Rational Numbers
5
23 (avg. 4.6)
4 (80.0%)
0 (0.0%)
Robot Simulator Robot Simulator
6
38 (avg. 6.3)
6 (100.0%)
0 (0.0%)
Roman Numerals Roman Numerals
6
26 (avg. 4.3)
5 (83.3%)
0 (0.0%)
Saddle Points Saddle Points
5
26 (avg. 5.2)
5 (100.0%)
0 (0.0%)
Secret Handshake Secret Handshake
5
16 (avg. 3.2)
5 (100.0%)
0 (0.0%)
Sieve Sieve
6
15 (avg. 2.5)
6 (100.0%)
0 (0.0%)
Space Age Space Age
5
14 (avg. 2.8)
5 (100.0%)
0 (0.0%)
Twelve Days Twelve Days
5
19 (avg. 3.8)
4 (80.0%)
0 (0.0%)
Word Count Word Count
6
20 (avg. 3.3)
6 (100.0%)
0 (0.0%)
Affine Cipher Affine Cipher
5
50 (avg. 10.0)
4 (80.0%)
0 (0.0%)
Anagram Anagram
7
27 (avg. 3.9)
6 (85.7%)
0 (0.0%)
Circular Buffer Circular Buffer
4
23 (avg. 5.8)
4 (100.0%)
0 (0.0%)
Clock Clock
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
Crypto Square Crypto Square
4
14 (avg. 3.5)
4 (100.0%)
0 (0.0%)
Gigasecond Gigasecond
5
53 (avg. 10.6)
5 (100.0%)
0 (0.0%)
Killer Sudoku Helper Killer Sudoku Helper
4
10 (avg. 2.5)
4 (100.0%)
0 (0.0%)
Knapsack Knapsack
4
7 (avg. 1.8)
4 (100.0%)
0 (0.0%)
List Ops List Ops
6
56 (avg. 9.3)
5 (83.3%)
0 (0.0%)
Matching Brackets Matching Brackets
5
29 (avg. 5.8)
5 (100.0%)
0 (0.0%)
Pig Latin Pig Latin
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Relative Distance Relative Distance
3
4 (avg. 1.3)
3 (100.0%)
0 (0.0%)
Robot Name Robot Name
4
7 (avg. 1.8)
4 (100.0%)
0 (0.0%)
Run-Length Encoding Run-Length Encoding
5
36 (avg. 7.2)
5 (100.0%)
0 (0.0%)
Save the Cow Save the Cow
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
Spiral Matrix Spiral Matrix
4
20 (avg. 5.0)
4 (100.0%)
0 (0.0%)
Split-Second Stopwatch Split-Second Stopwatch
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Square Root Square Root
6
20 (avg. 3.3)
6 (100.0%)
0 (0.0%)
State of Tic-Tac-Toe State of Tic-Tac-Toe
5
21 (avg. 4.2)
4 (80.0%)
0 (0.0%)
Tournament Tournament
5
42 (avg. 8.4)
4 (80.0%)
0 (0.0%)
Variable Length Quantity Variable Length Quantity
4
13 (avg. 3.3)
3 (75.0%)
0 (0.0%)
Yacht Yacht
5
41 (avg. 8.2)
5 (100.0%)
0 (0.0%)
All Your Base All Your Base
6
39 (avg. 6.5)
4 (66.7%)
0 (0.0%)
Binary Search Tree Binary Search Tree
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Change Change
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Conway's Game of Life Conway's Game of Life
4
38 (avg. 9.5)
4 (100.0%)
0 (0.0%)
Flower Field Flower Field
4
37 (avg. 9.3)
4 (100.0%)
0 (0.0%)
Food Chain Food Chain
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Intergalactic Transmission Intergalactic Transmission
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
OCR Numbers OCR Numbers
4
41 (avg. 10.3)
4 (100.0%)
0 (0.0%)
Parallel Letter Frequency Parallel Letter Frequency
4
4 (avg. 1.0)
3 (75.0%)
0 (0.0%)
Piecing It Together Piecing It Together
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
Rail Fence Cipher Rail Fence Cipher
4
15 (avg. 3.8)
4 (100.0%)
0 (0.0%)
Say Say
5
4 (avg. 0.8)
3 (60.0%)
0 (0.0%)
Two Bucket Two Bucket
4
38 (avg. 9.5)
4 (100.0%)
0 (0.0%)
Word Search Word Search
4
24 (avg. 6.0)
4 (100.0%)
0 (0.0%)
Bank Account Bank Account
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Book Store Book Store
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Custom Set Custom Set
4
16 (avg. 4.0)
4 (100.0%)
0 (0.0%)
Dominoes Dominoes
3
3 (avg. 1.0)
3 (100.0%)
0 (0.0%)
Grep Grep
4
5 (avg. 1.3)
3 (75.0%)
0 (0.0%)
Nth Prime Nth Prime
7
51 (avg. 7.3)
6 (85.7%)
0 (0.0%)
PaaS I/O PaaS I/O
3
5 (avg. 1.7)
3 (100.0%)
0 (0.0%)
Perfect Numbers Perfect Numbers
5
25 (avg. 5.0)
5 (100.0%)
0 (0.0%)
Rectangles Rectangles
5
4 (avg. 0.8)
3 (60.0%)
0 (0.0%)
Satellite Satellite
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
Simple Linked List Simple Linked List
4
3 (avg. 0.8)
3 (75.0%)
0 (0.0%)
Wordy Wordy
5
12 (avg. 2.4)
3 (60.0%)
0 (0.0%)
Zebra Puzzle Zebra Puzzle
4
5 (avg. 1.3)
3 (75.0%)
0 (0.0%)
Palindrome Products Palindrome Products
4
50 (avg. 12.5)
4 (100.0%)
1 (25.0%)
Pythagorean Triplet Pythagorean Triplet
4
32 (avg. 8.0)
4 (100.0%)
0 (0.0%)
Bowling Bowling
3
4 (avg. 1.3)
3 (100.0%)
0 (0.0%)
Connect Connect
4
32 (avg. 8.0)
4 (100.0%)
0 (0.0%)
Alphametics Alphametics
5
128 (avg. 25.6)
5 (100.0%)
0 (0.0%)
2 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Accumulate Accumulate
1
2 (avg. 2.0)
1 (100.0%)
0 (0.0%)
Binary Search (deprecated) Binary Search (deprecated)
3
10 (avg. 3.3)
3 (100.0%)
0 (0.0%)
22 unimplemented practice exercises
Baffling Birthdays Baffling Birthdays
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Camicia Camicia
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DOT DSL DOT DSL
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Error Handling Error Handling
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Forth Forth
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Go Counting Go Counting
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Ledger Ledger
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Lens Person Lens Person
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Linked List Linked List
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Markdown Markdown
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Poker Poker
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POV POV
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Prism Prism
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React React
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REST API REST API
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SGF Parsing SGF Parsing
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Simple Cipher Simple Cipher
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Strain Strain
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Swift Scheduling Swift Scheduling
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Transpose Transpose
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Tree Building Tree Building
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Zipper Zipper
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Test Runner

Learn More

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

Current version: 2c2879eac9c021ac8a1937d40deb98e7091cffd0 (Takes up to 10 mins to deploy)

Total Test Runner Runs
7,973
Test Run Pass Rate
21.3% (1696)
Test Run Fail Rate
57.6% (4594)
Test Run Error Rate
21.1% (1683)

Representer

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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.

Analyzer

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

Next goal: Build an Analyzer. Find out more.