Kata
Sign Up
Kata
Kumite
Forum
Wiki
Leaders
Log In
Sign Up
Library
Collections
Sort by:
Newest
Oldest
Popularity
Positive Feedback
Most Completed
Least Completed
Recently Published
Hardest
Easiest
Name
Language:
All
My Languages
Agda (Beta)
BF (Beta)
C
Clojure
CoffeeScript
Coq (Beta)
C++
Crystal
C#
Dart
Elixir
Elm (Beta)
Erlang (Beta)
Factor (Beta)
Forth (Beta)
Fortran (Beta)
F#
Go
Groovy (Beta)
Haskell
Idris (Beta)
Java
JavaScript
Julia (Beta)
Kotlin (Beta)
Lua (Beta)
NASM (Beta)
Nim (Beta)
Objective-C (Beta)
OCaml (Beta)
PHP
PowerShell (Beta)
PureScript (Beta)
Python
R (Beta)
Racket (Beta)
Reason (Beta)
Ruby
Rust
Scala (Beta)
Shell
Solidity (Beta)
SQL
Swift
TypeScript
VB (Beta)
Status:
Approved & Beta
Approved
Beta
Progress:
All
Kata I have not trained on
Kata I have not completed
Kata I have completed
Difficulty:
8 kyu
8 kyu
7 kyu
7 kyu
6 kyu
6 kyu
5 kyu
5 kyu
4 kyu
4 kyu
3 kyu
3 kyu
2 kyu
2 kyu
1 kyu
1 kyu
Tags:
Fundamentals (4001)
Algorithms (2953)
Data Types (2424)
Logic (2145)
Numbers (1272)
Strings (1167)
Puzzles (1157)
Arrays (1011)
Games (977)
Mathematics (968)
Basic Language Features (838)
Programming Paradigms (791)
Data Structures (567)
Control Flow (551)
Declarative Programming (488)
Advanced Language Features (345)
Regular Expressions (263)
Object-oriented Programming (242)
Functions (210)
Lists (208)
Functional Programming (173)
Arithmetic (170)
Loops (167)
Objects (141)
Bugs (131)
Data (126)
Algebra (125)
Theoretical Computer Science (114)
Security (111)
Performance (109)
Sorting (105)
Parsing (103)
Computability Theory (100)
Recursion (100)
Binary (95)
Classes (95)
Integers (93)
Optimization (91)
Utilities (86)
Cryptography (85)
Geometry (85)
Databases (83)
Information Systems (83)
SQL (81)
Graphs (79)
Dates/Time (73)
Sequences (64)
Design Principles (61)
Design Patterns (59)
Formatting (51)
1284 Kata Found
8 kyu
The 'if' function
114
114
29
70%
of
830
8,642
user578387
3 Issues Reported
Fundamentals
Functional Programming
Declarative Programming
Higher-order Functions
Functions
Control Flow
Basic Language Features
6 kyu
Lattice Point Interpolation
5
5
3
90%
of
5
8
abiessu
Algorithms
Numbers
Integers
Arrays
6 kyu
Vowels Back
28
28
4
84%
of
97
356
A.Partridge
1 Issue Reported
Algorithms
Fundamentals
Strings
Arrays
Loops
Control Flow
Basic Language Features
5 kyu
Decimal to Factorial and Back
185
185
35
91%
of
266
1,558
g964
Algorithms
Numbers
Utilities
6 kyu
Sort Arrays (Ignoring Case)
29
29
3
83%
of
230
3,891
ineiti
1 Issue Reported
Fundamentals
Arrays
Sorting
Algorithms
4 kyu
Sum of Intervals
474
474
101
91%
of
992
7,086
xDranik
2 Issues Reported
Algorithms
Aggregations
Arithmetic
Mathematics
Numbers
Integers
3 kyu
Alphametics Solver
115
115
25
94%
of
25
97
docgunthrop
Algorithms
Puzzles
Games
Performance
Optimization
Cryptography
Security
7 kyu
The wheat/rice and chessboard problem
48
48
10
92%
of
258
1,162
GiacomoSorbi
Puzzles
Mathematics
Algorithms
Numbers
Bitwise Operators
Bits
Operators
Advanced Language Features
Binary
Fundamentals
Recursion
Computability Theory
Theoretical Computer Science
8 kyu
Regexp Basics - is it a digit?
103
103
41
85%
of
752
5,353
taw
5 Issues Reported
Fundamentals
Regular Expressions
Declarative Programming
Advanced Language Features
Strings
5 kyu
Primes in numbers
710
710
134
91%
of
1,256
8,698
g964
Fundamentals
Numbers
Mathematics
Algorithms
Utilities
6 kyu
The Supermarket Queue
1611
1611
346
93%
of
2,540
14,056
mattlub
Fundamentals
Arrays
Loops
Control Flow
Basic Language Features
6 kyu
Tetris Series #2 — Primitive Gameplay
8
8
1
95%
of
19
46
Etoneja
Fundamentals
Games
Algorithms
Basic Language Features
Loops
Control Flow
Arrays
7 kyu
Remove anchor from URL
95
95
29
85%
of
965
9,900
jhoffner
1 Issue Reported
Fundamentals
Regular Expressions
Declarative Programming
Advanced Language Features
Strings
6 kyu
Build a pile of Cubes
1203
1203
146
85%
of
4,697
32,685
g964
1 Issue Reported
Fundamentals
Optimization
6 kyu
Create Phone Number
604
604
183
82%
of
6,050
54,989
xDranik
Algorithms
Arrays
Strings
Loops
Control Flow
Basic Language Features
Fundamentals
Formatting
Regular Expressions
Declarative Programming
Advanced Language Features
5 kyu
Master your primes: sieve with memoization
26
26
12
82%
of
25
68
GiacomoSorbi
Algorithms
Memoization
Design Patterns
Design Principles
Optimization
8 kyu
Yield to the Block
28
28
3
89%
of
94
2,450
agram
1 Issue Reported
Fundamentals
Blocks
Object-oriented Programming
Functions
Control Flow
Basic Language Features
Functional Programming
Declarative Programming
Higher-order Functions
5 kyu
Integers: Recreation One
905
905
161
88%
of
1,534
9,833
g964
Fundamentals
Algorithms
Optimization
7 kyu
Descending Order
819
819
146
88%
of
8,409
62,189
TastyOs
1 Issue Reported
Fundamentals
Functions
Control Flow
Basic Language Features
5 kyu
Closest and Smallest
174
174
33
89%
of
254
1,228
g964
Fundamentals
Sorting
Algorithms
6 kyu
Split Strings
289
289
107
86%
of
2,352
20,525
jhoffner
5 Issues Reported
Algorithms
Regular Expressions
Declarative Programming
Advanced Language Features
Fundamentals
Strings
7 kyu
Testing 1-2-3
56
56
11
95%
of
1,170
4,774
acr
Fundamentals
Arrays
Iterators
Control Flow
Object-oriented Programming
Basic Language Features
4 kyu
Sum Strings as Numbers
739
739
94
82%
of
1,753
12,810
nicknovitski
5 Issues Reported
Algorithms
Strings
Arithmetic
Mathematics
Numbers
Big Integers
Integers
Utilities
4 kyu
How many numbers III?
342
342
57
94%
of
241
1,125
raulbc777
1 Issue Reported
Fundamentals
Data Structures
Algorithms
Control Flow
Basic Language Features
Mathematics
Numbers
Declarative Programming
7 kyu
Sum of Cubes
25
25
8
90%
of
438
2,849
MementoMori
Fundamentals
Control Flow
Basic Language Features
8 kyu
Simple validation of a username with regex
94
94
39
93%
of
612
4,194
daymos
4 Issues Reported
Fundamentals
Regular Expressions
Declarative Programming
Advanced Language Features
Strings
Validation
Algorithms
4 kyu
Adding Big Numbers
264
264
54
83%
of
930
7,510
Becojo
6 Issues Reported
Algorithms
Mathematics
Numbers
Big Integers
Integers
6 kyu
Longest palindrome
27
27
9
90%
of
93
310
georgesykes86
Algorithms
Loops
Control Flow
Basic Language Features
Fundamentals
Arrays
Strings
6 kyu
Look and say sequence generator
28
28
6
95%
of
104
322
GiacomoSorbi
Fundamentals
Sequences
Arrays
Constructors
Basic Language Features
Strings
Regular Expressions
Declarative Programming
Advanced Language Features
Numbers
7 kyu
Find the longest gap!
53
53
6
93%
of
180
1,309
joh_pot
Fundamentals
Regular Expressions
Declarative Programming
Advanced Language Features
Strings
Loading...
Confirm