Exercises on the D Track | Exercism

Exercism v3 launches on Sept 1st 2021. Learn more! 🚀🚀🚀

Hello World

The classical introductory exercise. Just say "Hello, World!"

language basics

Leap

Given a year, report if it is a leap year.

language basics

Gigasecond

Given a moment, determine the moment that would be after a gigasecond has passed.

language basics

RNA Transcription

Given a DNA strand, return its RNA Complement Transcription.

control flow foreach

string manipulation

Raindrops

Convert a number to a string, the content of which depends on the number's factors.

control flow if statements

language basics

Bob

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

control flow if statements

string manipulation

ETL

We are going to do the `Transform` step of an Extract-Transform-Load.

associative arrays

control flow foreach

string manipulation

Hamming

Calculate the Hamming difference between two DNA strands.

control flow foreach

Nucleotide Count

Given a DNA string, compute how many times each nucleotide occurs in the string.

associative arrays

Robot Name

Manage robot factory settings.

Difference Of Squares

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.

control flow foreach

template metaprogramming

Roman Numerals

Write a function to convert from normal numbers to Roman Numerals.

string manipulation

Series

Given a string of digits, output all the contiguous substrings of length `n` in that string.

string manipulation

Triangle

Determine if a triangle is equilateral, isosceles, or scalene.

control flow if statements

language basics

Crypto Square

Implement the classic method for composing secret messages called a square code.

string manipulation

Circular Buffer

A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.

class templates

data structures

Pangram

Determine if a sentence is a pangram.

language basics

string manipulation

React

Implement a basic reactive system.

higher order functions

reactive programming

Run Length Encoding

Implement run-length encoding and decoding.

control flow if statements

Reverse String

Reverse a string

Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture

Armstrong Numbers

Determine if a number is an Armstrong number

Two Fer

Create a sentence of the form "One for X, one for me."

optional values

text formatting

Isogram

Determine if a word or phrase is an isogram.

Darts

Write a function that returns the earned points in a single toss of a Darts game

floating point numbers

Resistor Color

Convert a resistor band's color to its numeric representation

Resistor Color Duo

Convert color codes, as used on resistors, to a numeric value.

Perfect Numbers

Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for natural numbers.

exception handling

Sum Of Multiples

Given a number, find the sum of all the multiples of particular numbers up to but not including that number.

Prime Factors

Compute the prime factors of a given natural number.

Luhn

Given a number determine whether or not it is valid per the Luhn formula.

Nth Prime

Given a number n, determine what the nth prime is.

Matching Brackets

Make sure the brackets and braces all match.

Grains

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.