| Hello World |
The classical introductory exercise. Just say "Hello, World!" |
hello-world |
| Two Fer |
Create a sentence of the form "One for X, one for me." |
two-fer |
| Reverse String |
Reverse a string |
reverse-string |
| Armstrong Numbers |
Determine if a number is an Armstrong number |
armstrong-numbers |
| RNA Transcription |
Given a DNA strand, return its RNA complement (per RNA transcription). |
rna-transcription |
| Pangram |
Determine if a sentence is a pangram. |
pangram |
| Hamming |
Calculate the Hamming difference between two DNA strands. |
hamming |
| Gigasecond |
Calculate the moment when someone has lived for 10^9 seconds. |
gigasecond |
| Space Age |
Given an age in seconds, calculate how old someone is in terms of a given planet's solar years. |
space-age |
| Acronym |
Convert a long phrase to its acronym |
acronym |
| Scrabble Score |
Given a word, compute the scrabble score for that word. |
scrabble-score |
| Raindrops |
Convert a number to a string, the contents of which depend on the number's factors. |
raindrops |
| Difference Of Squares |
Find the difference between the square of the sum and the sum of the squares of the first N natural numbers. |
difference-of-squares |
| Secret Handshake |
Given a decimal number, convert it to the appropriate sequence of events for a secret handshake. |
secret-handshake |
| Perfect Numbers |
Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for natural numbers. |
perfect-numbers |
| Protein Translation |
Translate RNA sequences into proteins. |
protein-translation |
| Proverb |
For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme. |
proverb |
| ISBN Verifier |
Check if a given string is a valid ISBN-10 number. |
isbn-verifier |
| Sum of Multiples |
Given a number, find the sum of all the multiples of particular numbers up to but not including that number. |
sum-of-multiples |
| Luhn |
Given a number determine whether or not it is valid per the Luhn formula. |
luhn |
| Matrix |
Given a string representing a matrix of numbers, return the rows and columns of that matrix. |
matrix |
| Triangle |
Determine if a triangle is equilateral, isosceles, or scalene. |
triangle |
| Largest Series Product |
Given a string of digits, calculate the largest product for a contiguous substring of digits of length n. |
largest-series-product |
| Sieve |
Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number. |
sieve |
| Twelve Days |
Output the lyrics to 'The Twelve Days of Christmas' |
twelve-days |
| Rotational Cipher |
Create an implementation of the rotational cipher, also sometimes called the Caesar cipher. |
rotational-cipher |
| Kindergarten Garden |
Given a diagram, determine which plants each child in the kindergarten class is responsible for. |
kindergarten-garden |
| Collatz Conjecture |
Calculate the number of steps to reach 1 using the Collatz conjecture |
collatz-conjecture |
| Nth Prime |
Given a number n, determine what the nth prime is. |
nth-prime |
| Saddle Points |
Detect saddle points in a matrix. |
saddle-points |
| Diamond |
Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point. |
diamond |
| Isogram |
Determine if a word or phrase is an isogram. |
isogram |
| Flatten Array |
Take a nested list and return a single list with all values except nil/null |
flatten-array |
| Pig Latin |
Implement a program that translates from English to Pig Latin |
pig-latin |
| Phone Number |
Clean up user-entered phone numbers so that they can be sent SMS messages. |
phone-number |
| Nucleotide Count |
Given a DNA string, compute how many times each nucleotide occurs in the string. |
nucleotide-count |
| Word Count |
Given a phrase, count the occurrences of each word in that phrase. |
word-count |
| Run Length Encoding |
Implement run-length encoding and decoding. |
run-length-encoding |
| Robot Name |
Manage robot factory settings. |
robot-name |
| Prime Factors |
Compute the prime factors of a given natural number. |
prime-factors |
| Allergies |
Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies. |
allergies |
| Bob |
Bob is a lackadaisical teenager. In conversation, his responses are very limited. |
bob |
| Pascals Triangle |
Compute Pascal's triangle up to a given number of rows. |
pascals-triangle |
| Bracket Push |
Make sure the brackets and braces all match. |
bracket-push |
| Series |
Given a string of digits, output all the contiguous substrings of length n in that string. |
series |
| Atbash Cipher |
Create an implementation of the atbash cipher, an ancient encryption system created in the Middle East. |
atbash-cipher |
| Spiral Matrix |
Given the size, return a square matrix of numbers in spiral order. |
spiral-matrix |
| Roman Numerals |
Write a function to convert from normal numbers to Roman Numerals. |
roman-numerals |
| Transpose |
Take input text and output it transposed. |
transpose |
| House |
Output the nursery rhyme 'This is the House that Jack Built'. |
house |
| Food Chain |
Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly' |
food-chain |
| Beer Song |
Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall. |
beer-song |
| Queen Attack |
Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other. |
queen-attack |
| Etl |
We are going to do the 'Transform' step of an Extract-Transform-Load. |
etl |
| Grade School |
Given students' names along with the grade that they are in, create a roster for the school |
grade-school |
| Robot Simulator |
Write a robot simulator. |
robot-simulator |
| Binary Search |
Implement a binary search algorithm. |
binarysearch |
| Minesweeper |
Add the numbers to a minesweeper board |
minesweeper |
| Wordy |
Parse and evaluate simple math word problems returning the answer as an integer. |
wordy |
| Parallel Letter Frequency |
Calculate frequency of letters parallelly |
parallel-letter-frequency |