Tcl

via Exercism

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Exercism
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Free Online Course
Languages

English
Sessions

Self-Paced
Level

Intermediate

Found in

Tcl, pronounced "tickle" and short for Tool Command Language, is a dynamic, open source programming language. It was designed with the goal of being very simple but powerful. It is so simple that the entire syntax is fully described in just 12 rules. Yet it is a fully-featured programming language.

Syllabus

Hello World

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

Leap

Determine whether a given year is a leap year.

Micro Blog

Given an input string, truncate it to 5 characters.

RNA Transcription

Given a DNA strand, return its RNA complement.

Resistor Color

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

Two Fer

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

All Your Base

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

Anagram

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

Collatz Conjecture

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

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.

Gigasecond

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

Hamming

Calculate the Hamming distance between two DNA strands.

House

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

ISBN Verifier

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

Isogram

Determine if a word or phrase is an isogram.

Line Up

Help lining up customers at Yaʻqūb's Deli.

Matching Brackets

Make sure the brackets and braces all match.

Nucleotide Count

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

Raindrops

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

Resistor Color Duo

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

Resistor Color Trio

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

Reverse String

Reverse a given string.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Rotational Cipher

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

Scrabble Score

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

Series

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

Space Age

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

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.

Acronym

Convert a long phrase to its acronym.

Affine Cipher

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

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.

Bank Account

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

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.

Diamond

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

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

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.

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.

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.

Kindergarten Garden

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

Largest Series Product

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

Luhn

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

Markdown

Refactor a Markdown parser.

Matrix

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

Meetup

Calculate the date of meetups.

Pangram

Determine if a sentence is a pangram.

Perfect Numbers

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

Phone Number

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

Pig Latin

Implement a program that translates from English to Pig Latin.

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.

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.

Robot Name

Manage robot factory settings.

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.

Spiral Matrix

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

Square Root

Given a natural radicand, return its square root.

Strain

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

Twelve Days

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

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Word Count

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

Allergies

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

Binary Search

Implement a binary search algorithm.

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.

Dominoes

Make a chain of dominoes.

Food Chain

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

Grade School

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

Linked List

Implement a doubly linked list.

Nth Prime

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

OCR Numbers

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

Pascal's Triangle

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

Rational Numbers

Implement rational numbers.

Run-Length Encoding

Implement run-length encoding and decoding.

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.

Swift Scheduling

Convert delivery date descriptions to actual delivery dates.

Transpose

Take input text and output it transposed.

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.

Bowling

Score a bowling game.

Change

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

Conway's Game of Life

Implement Conway's Game of Life.

Flower Field

Mark all the flowers in a garden.

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.

List Ops

Implement basic list operations.

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Poker

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

Pythagorean Triplet

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

Relative Distance

Given a family tree, calculate the degree of separation.

Saddle Points

Detect saddle points in a matrix.

Satellite

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

Split-Second Stopwatch

Keep track of time through a digital stopwatch.

State of Tic-Tac-Toe

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

Tournament

Tally the results of a small football competition.

Two Bucket

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

Alphametics

Given an alphametics puzzle, find the correct solution.

Baffling Birthdays

Estimate the birthday paradox's probabilities.

Binary Search Tree

Insert and search for numbers in a binary tree.

Forth

Implement an evaluator for a very simple subset of Forth.

Grep

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

Intergalactic Transmission

Add parity bits to a message for transmission

Palindrome Products

Detect palindrome products in a given range.

Piecing It Together

Fill in missing jigsaw puzzle details from partial data

Prism

Calculate the path of a laser through refractive prisms.

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

Robot Simulator

Write a robot simulator.

Camicia

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

Connect

Compute the result for a game of Hex / Polygon.

DOT DSL

Write a Domain Specific Language similar to the Graphviz dot language.

REST API

Implement a RESTful API for tracking IOUs.

Rectangles

Count the rectangles in an ASCII diagram.

Word Search

Create a program to solve a word search puzzle.

Zipper

Creating a zipper for a binary tree.

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.