LFE Track Management

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

Students
308
Submissions
2,330
Mentoring Discussions
24

The LFE track needs attention ⚠️

Building

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.

Synced primary repo: 6ebe6f04e8e65ad67d1671b0ae1199c69a3f2e80 (Updates should be instant)

Next goal: Implement 132 practice exercises. Find out more.
53 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
182
195 (avg. 1.1)
145 (79.7%)
0 (0.0%)
Acronym Acronym
9
61 (avg. 6.8)
1 (11.1%)
0 (0.0%)
Anagram Anagram
28
100 (avg. 3.6)
14 (50.0%)
0 (0.0%)
Atbash Cipher Atbash Cipher
13
48 (avg. 3.7)
7 (53.8%)
0 (0.0%)
Binary Binary
14
95 (avg. 6.8)
7 (50.0%)
0 (0.0%)
Bob Bob
21
100 (avg. 4.8)
15 (71.4%)
3 (14.3%)
Collatz Conjecture Collatz Conjecture
4
21 (avg. 5.3)
1 (25.0%)
0 (0.0%)
Darts Darts
3
6 (avg. 2.0)
2 (66.7%)
0 (0.0%)
Difference of Squares Difference of Squares
9
19 (avg. 2.1)
7 (77.8%)
0 (0.0%)
Gigasecond Gigasecond
8
43 (avg. 5.4)
1 (12.5%)
0 (0.0%)
Grains Grains
13
22 (avg. 1.7)
10 (76.9%)
1 (7.7%)
Hamming Hamming
15
39 (avg. 2.6)
11 (73.3%)
1 (6.7%)
Isogram Isogram
2
6 (avg. 3.0)
1 (50.0%)
0 (0.0%)
Leap Leap
71
158 (avg. 2.2)
54 (76.1%)
9 (12.7%)
Nucleotide Count Nucleotide Count
9
25 (avg. 2.8)
6 (66.7%)
0 (0.0%)
Resistor Color Resistor Color
3
17 (avg. 5.7)
1 (33.3%)
0 (0.0%)
Resistor Color Duo Resistor Color Duo
2
19 (avg. 9.5)
1 (50.0%)
0 (0.0%)
Queen Attack Queen Attack
3
7 (avg. 2.3)
1 (33.3%)
0 (0.0%)
RNA Transcription RNA Transcription
29
42 (avg. 1.4)
25 (86.2%)
6 (20.7%)
Secret Handshake Secret Handshake
2
7 (avg. 3.5)
1 (50.0%)
0 (0.0%)
Space Age Space Age
11
40 (avg. 3.6)
8 (72.7%)
0 (0.0%)
Strain Strain
13
15 (avg. 1.2)
10 (76.9%)
0 (0.0%)
Sum of Multiples Sum of Multiples
16
23 (avg. 1.4)
11 (68.8%)
2 (12.5%)
Trinary Trinary
7
12 (avg. 1.7)
2 (28.6%)
0 (0.0%)
Two-Fer Two-Fer
3
23 (avg. 7.7)
1 (33.3%)
0 (0.0%)
Raindrops Raindrops
8
13 (avg. 1.6)
3 (37.5%)
0 (0.0%)
Eliud's Eggs Eliud's Eggs
3
5 (avg. 1.7)
1 (33.3%)
0 (0.0%)
Reverse String Reverse String
4
27 (avg. 6.8)
1 (25.0%)
0 (0.0%)
Scrabble Score Scrabble Score
3
27 (avg. 9.0)
1 (33.3%)
0 (0.0%)
Protein Translation Protein Translation
4
48 (avg. 12.0)
1 (25.0%)
0 (0.0%)
D&D Character D&D Character
3
6 (avg. 2.0)
1 (33.3%)
0 (0.0%)
Pangram Pangram
3
11 (avg. 3.7)
1 (33.3%)
0 (0.0%)
List Ops List Ops
3
30 (avg. 10.0)
1 (33.3%)
0 (0.0%)
Triangle Triangle
3
6 (avg. 2.0)
1 (33.3%)
0 (0.0%)
Binary Search Binary Search
3
15 (avg. 5.0)
1 (33.3%)
0 (0.0%)
Square Root Square Root
3
7 (avg. 2.3)
1 (33.3%)
0 (0.0%)
Allergies Allergies
40
155 (avg. 3.9)
5 (12.5%)
0 (0.0%)
Bank Account Bank Account
9
74 (avg. 8.2)
1 (11.1%)
1 (11.1%)
Clock Clock
8
135 (avg. 16.9)
2 (25.0%)
0 (0.0%)
ETL ETL
6
88 (avg. 14.7)
1 (16.7%)
0 (0.0%)
Grade School Grade School
8
12 (avg. 1.5)
3 (37.5%)
0 (0.0%)
Largest Series Product Largest Series Product
6
16 (avg. 2.7)
1 (16.7%)
0 (0.0%)
Luhn Luhn
7
107 (avg. 15.3)
2 (28.6%)
0 (0.0%)
Meetup Meetup
5
52 (avg. 10.4)
1 (20.0%)
0 (0.0%)
Parallel Letter Frequency Parallel Letter Frequency
8
64 (avg. 8.0)
2 (25.0%)
0 (0.0%)
Phone Number Phone Number
8
26 (avg. 3.3)
3 (37.5%)
0 (0.0%)
Robot Simulator Robot Simulator
7
46 (avg. 6.6)
3 (42.9%)
0 (0.0%)
Series Series
5
4 (avg. 0.8)
1 (20.0%)
0 (0.0%)
Word Count Word Count
9
7 (avg. 0.8)
4 (44.4%)
0 (0.0%)
Roman Numerals Roman Numerals
4
5 (avg. 1.3)
1 (25.0%)
0 (0.0%)
Sieve Sieve
4
42 (avg. 10.5)
2 (50.0%)
0 (0.0%)
Beer Song Beer Song
7
32 (avg. 4.6)
1 (14.3%)
0 (0.0%)
Circular Buffer Circular Buffer
9
117 (avg. 13.0)
2 (22.2%)
1 (11.1%)
1 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Accumulate Accumulate
3
10 (avg. 3.3)
3 (100.0%)
2 (66.7%)
79 unimplemented practice exercises
Affine Cipher Affine Cipher
All Your Base All Your Base
Alphametics Alphametics
Armstrong Numbers Armstrong Numbers
Binary Search Tree Binary Search Tree
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Complex Numbers Complex Numbers
Connect Connect
Conway's Game of Life Conway's Game of Life
Crypto Square Crypto Square
Custom Set Custom Set
Diamond Diamond
Dominoes Dominoes
DOT DSL DOT DSL
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Go Counting Go Counting
Grep Grep
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
Markdown Markdown
Matching Brackets Matching Brackets
Matrix Matrix
Micro Blog Micro Blog
Minesweeper Minesweeper
Nth Prime Nth Prime
OCR Numbers OCR Numbers
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Pascal's Triangle Pascal's Triangle
Perfect Numbers Perfect Numbers
Pig Latin Pig Latin
Poker Poker
POV POV
Prime Factors Prime Factors
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Resistor Color Trio Resistor Color Trio
REST API REST API
Robot Name Robot Name
Rotational Cipher Rotational Cipher
Run-Length Encoding Run-Length Encoding
Saddle Points Saddle Points
Satellite Satellite
Say Say
SGF Parsing SGF Parsing
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Spiral Matrix Spiral Matrix
State of Tic-Tac-Toe State of Tic-Tac-Toe
Sublist Sublist
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Twelve Days Twelve Days
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Wordy Wordy
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper

Programming Tags

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Help manage the tags used to group, filter and recommend solutions, approaches and articles.

0 tags

Test Runner

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

Current version: 017f86a6c1d8c844a3531e8bd0613c10b537d8f5 (Takes up to 10 mins to deploy)

Next goal: Get Test Runners to Version 2. LFE is currently utilising a Version 1 Test Runner. Find out more.
Total Test Runner Runs
2,245
Test Run Pass Rate
24.1% (541)
Test Run Fail Rate
73.5% (1649)
Test Run Error Rate
2.4% (55)

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 LFE: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Next goal: Build an Analyzer. Find out more.