Standard ML

via Exercism

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Exercism
Pricing

Free Online Course
Languages

English
Sessions

Self-Paced
Level

Intermediate

Found in

Standard ML (SML) is one of the two main dialects of the ML programming language. ML was the first strong statically typed language, developed in the early 1970s at the University of Edinburgh. Despite its age, SML feels very young in many ways; SML had features that mainstream languages would not pick up for decades and are still being experimented with today.

Syllabus

Hello World

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

Leap

Determine whether a given year is a leap year.

Two-Fer

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

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.

Allergies

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

Armstrong Numbers

Determine if a number is an Armstrong number.

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

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.

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.

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.

Hamming

Calculate the Hamming distance between two DNA strands.

Nucleotide Count

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

Pangram

Determine if a sentence is a pangram.

Pascal's Triangle

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

Raindrops

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

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.

Reverse String

Reverse a given string.

RNA Transcription

Given a DNA strand, return its RNA complement.

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.

Anagram

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

Atbash Cipher

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

Binary Search

Implement a binary search algorithm.

ISBN Verifier

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

Isogram

Determine if a word or phrase is an isogram.

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.

Line Up

Help lining up customers at Yaʻqūb's Deli.

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.

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 Trio

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

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.

Secret Handshake

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

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.

Strain

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

Twelve Days

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

All Your Base

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

Bottle Song

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

Diamond

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

Gigasecond

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

House

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

List Ops

Implement basic list operations.

Luhn

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

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.

Nth Prime

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

Pig Latin

Implement a program that translates from English to Pig Latin.

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 Simulator

Write a robot simulator.

Run-Length Encoding

Implement run-length encoding and decoding.

Saddle Points

Detect saddle points in a matrix.

Sieve

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

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.

Yacht

Score a single throw of dice in the game Yacht.

Crypto Square

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

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.

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.

Pythagorean Triplet

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

Rational Numbers

Implement rational numbers.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

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

Spiral Matrix

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

Split-Second Stopwatch

Keep track of time through a digital stopwatch.

Transpose

Take input text and output it transposed.

Wordy

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

Binary Search Tree

Insert and search for numbers in a binary tree.

Palindrome Products

Detect palindrome products in a given range.

Piecing It Together

Fill in missing jigsaw puzzle details from partial data

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

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.