3,528
students have developed their Emacs Lisp skills on Exercism.

Students
3,528
Submissions
16,517
Mentoring Discussions
916

The Emacs Lisp track needs attention ⚠️

Building

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Use your knowledge to build the Emacs Lisp track itself

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
13,456
Test Run Pass Rate
49.9% (6720)
Test Run Fail Rate
27.6% (3720)
Test Run Error Rate
22.4% (3016)

Build Analyzers

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Build an Analyzer for Emacs Lisp: 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 at least 40 practice exercises. Find out more.

Usage statistics

30 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
2,276
3,048 (avg. 1.3)
1,742 (76.5%)
6 (0.3%)
Two Fer Two Fer
1,315
2,806 (avg. 2.1)
841 (64.0%)
340 (25.9%)
Leap Leap
686
1,528 (avg. 2.2)
529 (77.1%)
109 (15.9%)
Anagram Anagram
543
1,719 (avg. 3.2)
322 (59.3%)
88 (16.2%)
Roman Numerals Roman Numerals
274
578 (avg. 2.1)
177 (64.6%)
46 (16.8%)
Hamming Hamming
305
585 (avg. 1.9)
252 (82.6%)
62 (20.3%)
RNA Transcription RNA Transcription
221
450 (avg. 2.0)
182 (82.4%)
39 (17.6%)
Bob Bob
451
963 (avg. 2.1)
320 (71.0%)
106 (23.5%)
Word Count Word Count
174
441 (avg. 2.5)
121 (69.5%)
25 (14.4%)
Acronym Acronym
134
271 (avg. 2.0)
107 (79.9%)
5 (3.7%)
Allergies Allergies
150
388 (avg. 2.6)
121 (80.7%)
5 (3.3%)
Armstrong Numbers Armstrong Numbers
122
180 (avg. 1.5)
96 (78.7%)
2 (1.6%)
All Your Base All Your Base
12
18 (avg. 1.5)
7 (58.3%)
0 (0.0%)
Difference of Squares Difference of Squares
330
421 (avg. 1.3)
275 (83.3%)
17 (5.2%)
ETL ETL
125
187 (avg. 1.5)
89 (71.2%)
3 (2.4%)
Gigasecond Gigasecond
250
499 (avg. 2.0)
167 (66.8%)
10 (4.0%)
Grains Grains
115
253 (avg. 2.2)
88 (76.5%)
5 (4.3%)
Nucleotide Count Nucleotide Count
110
178 (avg. 1.6)
84 (76.4%)
6 (5.5%)
Pangram Pangram
166
246 (avg. 1.5)
123 (74.1%)
8 (4.8%)
Perfect Numbers Perfect Numbers
103
187 (avg. 1.8)
78 (75.7%)
1 (1.0%)
Raindrops Raindrops
124
181 (avg. 1.5)
99 (79.8%)
6 (4.8%)
Trinary Trinary
84
112 (avg. 1.3)
64 (76.2%)
0 (0.0%)
Atbash Cipher Atbash Cipher
118
179 (avg. 1.5)
88 (74.6%)
6 (5.1%)
Crypto Square Crypto Square
74
117 (avg. 1.6)
52 (70.3%)
1 (1.4%)
Phone Number Phone Number
95
140 (avg. 1.5)
70 (73.7%)
2 (2.1%)
Robot Name Robot Name
143
222 (avg. 1.6)
98 (68.5%)
10 (7.0%)
Run-Length Encoding Run-Length Encoding
92
148 (avg. 1.6)
64 (69.6%)
2 (2.2%)
Luhn Luhn
86
169 (avg. 2.0)
56 (65.1%)
3 (3.5%)
List Ops List Ops
17
50 (avg. 2.9)
10 (58.8%)
0 (0.0%)
Sublist Sublist
7
3 (avg. 0.4)
3 (42.9%)
0 (0.0%)
1 deprecated practice exercises
Started
Attempts
Completions
Mentoring requests
Binary Binary
164
250 (avg. 1.5)
135 (82.3%)
6 (3.7%)
99 unimplemented practice exercises
Affine Cipher Affine Cipher
Alphametics Alphametics
Bank Account Bank Account
Binary Search Binary Search
Binary Search Tree Binary Search Tree
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Circular Buffer Circular Buffer
Clock Clock
Collatz Conjecture Collatz Conjecture
Complex Numbers Complex Numbers
Connect Connect
Custom Set Custom Set
D&D Character D&D Character
DOT DSL DOT DSL
Darts Darts
Diamond Diamond
Dominoes Dominoes
Error Handling Error Handling
Flatten Array Flatten Array
Food Chain Food Chain
Forth Forth
Go Counting Go Counting
Grade School Grade School
Grep Grep
Hangman Hangman
High Scores High Scores
House House
ISBN Verifier ISBN Verifier
Isogram Isogram
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Largest Series Product Largest Series Product
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
Markdown Markdown
Matching Brackets Matching Brackets
Matrix Matrix
Meetup Meetup
Micro Blog Micro Blog
Minesweeper Minesweeper
Nth Prime Nth Prime
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Parallel Letter Frequency Parallel Letter Frequency
Pascal's Triangle Pascal's Triangle
Pig Latin Pig Latin
Poker Poker
Prime Factors Prime Factors
Protein Translation Protein Translation
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
Queen Attack Queen Attack
REST API REST API
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Resistor Color Resistor Color
Resistor Color Duo Resistor Color Duo
Resistor Color Trio Resistor Color Trio
Reverse String Reverse String
Robot Simulator Robot Simulator
Rotational Cipher Rotational Cipher
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Say Say
Scale Generator Scale Generator
Scrabble Score Scrabble Score
Secret Handshake Secret Handshake
Series Series
Sieve Sieve
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Space Age Space Age
Spiral Matrix Spiral Matrix
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Sum of Multiples Sum of Multiples
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Triangle Triangle
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