Go

via Exercism

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Exercism
Pricing

Free Online Course
Languages

English
Sessions

On-Demand
Level

Beginner

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Fans of Go (called gophers) describe Go as having the expressiveness of dynamic languages like Python or Ruby, with the performance of compiled languages like C or C++.

The language is open source, and was started by engineers at Google. It's written using a C-style syntax, has statically typed variables, manages memory using garbage collection, and is compiled into stand-alone executables.

Go is noted for the concurrent programming features built into the language core, the networking packages in the standard library (such as a web server), fast compilation and execution speed. Its simple, minimalistic and consistent language design make for a delightful experience, while the abundant and thoughtful tooling addresses traditional problems such as consistent formatting and documentation.

The home page for Go is golang.org, and there is an excellent interactive tutorial at tour.golang.org.

Syllabus

Hello World

Exercism's classic introductory exercise. Just say "Hello, World!".

Gopher's Gorgeous Lasagna

Learn about packages, functions, and variables by helping Gopher cook lasagna.

Annalyn's Infiltration

Learn about booleans by helping Annalyn free her best friend.

Party Robot

Learn about strings by programming a party robot.

Weather Forecast

Learn about comments by helping a weather station manage their weather forecasting program.

Blackjack

Learn about conditionals by playing Blackjack.

Booking up for Beauty

Learn about time by handling appointments in a beauty salon.

Cars Assemble

Learn about numbers and type conversion by analyzing an assembly line in a car factory.

Vehicle Purchase

Learn about comparison and conditional-ifs while preparing for your next vehicle purchase

Gross Store

Learn about maps by selling items by the dozen at the Gross Store.

Lasagna Master

Dive deeper into Go functions while preparing to cook the perfect lasagna.

Need For Speed

Learn about structs by racing remote controlled cars.

Elon's Toys

Learn about methods by playing with Elon's toys

Bird Watcher

Count the birds in your garden with for loops.

Card Tricks

Learn about slices by doing card tricks.

Logs, Logs, Logs!

Learn about the strings package by parsing logs.

Sorting Room

Learn about type casting and type assertions in the sorting room.

Chessboard

Learn about iterating ranges by generating a chessboard.

Airport Robot

Learn about defining and implementing interfaces by programming an airport service robot.

The Farm

Learn about error handling in Go while feeding cows on the farm.

Census

Learn about zero values.

Welcome To Tech Palace!

Learn about strings and the strings package by generating text for a store's new display.

Election Day

Learn about pointers by creating a simple voting system.

Interest is Interesting

Learn about floating point numbers by adding interest to savings accounts.

Expenses

Learn about first-class functions by helping Bob manage expense records.

Animal Magic

Learn how to work with pseudo-random numbers

Parsing Log Files

Learn about regular expressions by parsing logs.

Meteorology

Format metereological data of custom types into strings.

Collatz Conjecture

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

Gigasecond

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

Raindrops

Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.

Two Fer

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

Darts

Calculate the points scored in a single toss of a Darts game.

Difference of Squares

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

Hamming

Calculate the Hamming distance between two DNA strands.

Isogram

Determine if a word or phrase is an isogram.

Leap

Determine whether a given year is a leap year.

Luhn

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

Micro Blog

Given an input string, truncate it to 5 characters.

Nucleotide Count

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

Pangram

Determine if a sentence is a pangram.

Resistor Color

Convert a resistor band's color to its numeric representation.

Reverse String

Reverse a given string.

RNA Transcription

Given a DNA strand, return its RNA complement.

Scrabble Score

Given a word, compute the Scrabble score for that word.

Space Age

Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.

Acronym

Convert a long phrase to its acronym.

Anagram

Given a word and a list of possible anagrams, select the correct sublist.

Armstrong Numbers

Determine if a number is an Armstrong number.

Atbash Cipher

Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.

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

Bottle Song

Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.

Clock

Implement a clock that handles times without dates.

Complex Numbers

Implement complex numbers.

D&D Character

Randomly generate Dungeons & Dragons characters.

Eliud's Eggs

Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.

Change the data format for scoring a game to more easily add other languages.

Grains

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

High Scores

Manage a player's High Score list.

ISBN Verifier

Check if a given string is a valid ISBN-10 number.

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.

Line Up

Help lining up customers at Yaʻqūb's Deli.

List Ops

Implement basic list operations.

Nth Prime

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

Phone Number

Clean up user-entered phone numbers so that they can be sent SMS messages.

Prime Factors

Compute the prime factors of a given natural number.

Protein Translation

Translate RNA sequences into proteins.

Proverb

For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.

Resistor Color Duo

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

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Rotational Cipher

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.

Series

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

Sieve

Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.

Simple Cipher

Implement the Vigenère cipher, a simple substitution cipher.

Square Root

Given a natural radicand, return its square root.

Sublist

Write a function to determine if a list is a sublist of another list.

Sum of Multiples

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

Triangle

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

Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'.

Word Count

Given a phrase, count the occurrences of each word in that phrase.

Affine Cipher

Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.

Allergies

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.

Baffling Birthdays

Estimate the birthday paradox's probabilities.

Bank Account

Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!

Binary Search

Implement a binary search algorithm.

Binary Search Tree

Insert and search for numbers in a binary tree.

Circular Buffer

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

Crypto Square

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

Custom Set

Create a custom set type.

Diamond

Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.

Diffie-Hellman

Diffie-Hellman key exchange.

Error Handling

Implement various kinds of error handling and resource management.

Flatten Array

Take a nested list and return a single list with all values except nil/null.

Flower Field

Mark all the flowers in a garden.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.

Conway's Game of Life

Implement Conway's Game of Life.

Grep

Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.

Hangman

Implement the logic of the hangman game using functional reactive programming.

House

Output the nursery rhyme 'This is the House that Jack Built'.

Kindergarten Garden

Given a diagram, determine which plants each child in the kindergarten class is responsible for.

Linked List

Implement a doubly linked list.

Matching Brackets

Make sure the brackets and braces all match.

Matrix

Given a string representing a matrix of numbers, return the rows and columns of that matrix.

Meetup

Calculate the date of meetups.

PaaS I/O

Report network IO statistics.

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Pascal's Triangle

Compute Pascal's triangle up to a given number of rows.

Perfect Numbers

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

Pig Latin

Implement a program that translates from English to Pig Latin.

Pythagorean Triplet

Given an integer N, find all Pythagorean triplets for which a + b + c = N.

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.

Rational Numbers

Implement rational numbers.

Resistor Color Trio

Convert color codes, as used on resistors, to a human-readable label.

Robot Name

Manage robot factory settings.

Run-Length Encoding

Implement run-length encoding and decoding.

Saddle Points

Detect saddle points in a matrix.

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

Simple Linked List

Write a simple linked list implementation that uses Elements and a List.

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Strain

Implement the `keep` and `discard` operation on collections.

Tournament

Tally the results of a small football competition.

Transpose

Take input text and output it transposed.

Tree Building

Refactor a tree building algorithm.

Word Search

Create a program to solve a word search puzzle.

Wordy

Parse and evaluate simple math word problems returning the answer as an integer.

Yacht

Score a single throw of dice in the game Yacht.

Camicia

Simulate the card game and determine whether the match ends or enters an infinite loop.

Grade School

Given students' names along with the grade that they are in, create a roster for the school.

Ledger

Refactor a ledger printer.

Markdown

Refactor a Markdown parser.

Prism

Calculate the path of a laser through refractive prisms.

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

Rectangles

Count the rectangles in an ASCII diagram.

Relative Distance

Given a family tree, calculate the degree of separation.

REST API

Implement a RESTful API for tracking IOUs.

SGF Parsing

Parsing a Smart Game Format string.

State of Tic-Tac-Toe

Determine the game state of a match of Tic-Tac-Toe.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Alphametics

Given an alphametics puzzle, find the correct solution.

Bowling

Score a bowling game.

Change

Correctly determine change to be given using the least number of coins.

Dominoes

Make a chain of dominoes.

Go Counting

Count the scored points on a Go board.

Intergalactic Transmission

Add parity bits to a message for transmission

Killer Sudoku Helper

Write a tool that makes it easier to solve Killer Sudokus

Knapsack

Given a knapsack that can only carry a certain weight, determine which items to put in the knapsack in order to maximize their combined value.

Palindrome Products

Detect palindrome products in a given range.

Poker

Pick the best hand(s) from a list of poker hands.

Reparent a graph on a selected node.

Robot Simulator

Write a robot simulator.

Satellite

Rebuild binary trees from pre-order and in-order traversals.

Split-Second Stopwatch

Keep track of time through a digital stopwatch.

Two Bucket

Given two buckets of different size, demonstrate how to measure an exact number of liters.

Zipper

Creating a zipper for a binary tree.

OCR Numbers

Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.

Piecing It Together

Fill in missing jigsaw puzzle details from partial data

React

Implement a basic reactive system.

Given a number from 0 to 999,999,999,999, spell out that number in English.

Swift Scheduling

Convert delivery date descriptions to actual delivery dates.

Book Store

To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts of multiple-book purchases.