What you'll learn:
- Write and run Haskell programs using main, do notation, print, and putStrLn with string formatting and escape sequences
- Perform arithmetic with integers, floats, two division operators, and math functions like abs, sqrt, round, and ceiling
- Define pure functions with Haskell's clean syntax, multiple parameters, guards, and the where clause for local bindings
- Work with Booleans, comparison operators, logical operators, short-circuit evaluation, and if-then-else expressions
- Create, concatenate, index, and generate lists using ranges, the cons operator, and powerful list comprehensions
- Read and write type signatures with :: and -> notation for Int, Float, Double, Bool, Char, and String
- Leverage type inference, resolve ambiguity with explicit annotations, and write polymorphic functions with type variables
- Use type class constraints like Eq, Ord, Show, and Num to write flexible, reusable, and type-safe functions
- Master pattern matching on literals, Booleans, empty lists, and head-tail decomposition to replace complex conditionals
- Compose functions with the dot operator, write lambdas, apply currying and partial application, and use map and filter
This course contains the use of artificial intelligence (AI).
Embark on an enchanting journey into Haskell — the purely functional programming language where code reads like poetry and types tell stories. Whether you're curious about functional programming, eager to think differently about problem-solving, or ready to write code that practically debugs itself, this beginner-friendly course takes you from your very first putStrLn to mastering higher-order functions, currying, and elegant data transformation pipelines through three carefully structured sections.
You'll begin by discovering the magic of pure functional programming, writing your first Haskell programs using main, do notation, print, and putStrLn to display output to the console. You'll explore the difference between print and putStrLn, master string formatting with escape sequences, and build interactive-looking output with professional layouts . From there, you'll dive into numbers and basic arithmetic — integers, floating-point numbers, the tale of two division operators (/ vs div and mod), mathematical functions like abs, sqrt, max, min, round, ceiling, and floor, and type mixing with fromIntegral . You'll define your own functions with Haskell's elegant syntax where parameters need no parentheses or commas, build utility functions with guards, and compose simple functions into powerful operations using the dot operator . The section wraps up with Booleans and comparisons — True, False, ==, /=, &&, ||, not, short-circuit evaluation — and Haskell's distinctive if-then-else expressions that always return a value, plus your first exploration of lists with square bracket notation, ++ concatenation, !! indexing, head, tail, ranges, and list comprehensions.
Next, you'll unlock the secret language of Haskell's type system, learning to read and write type signatures using the double colon :: notation . You'll master fundamental types — Int, Integer, Float, Double, Bool, Char, and String — understanding when to use each one . The elegant arrow notation -> reveals how functions transform inputs into outputs, from simple Int -> Bool signatures to multi-parameter chains and functions that return functions like Int -> (Int -> Int) . You'll experience type inference magic, where Haskell automatically deduces types while maintaining complete safety, and learn when explicit annotations are essential — like resolving ambiguity with read . Polymorphic types with type variables like a and b unlock incredibly reusable code, while type classes — Eq for equality, Ord for ordering, Show for string conversion, Num for arithmetic — group types by shared capabilities and enable powerful constrained polymorphism . The section culminates with custom type aliases using the type keyword, transforming cryptic signatures into self-documenting code with meaningful names like type Age = Int and type GameState = [Character] .
Finally, you'll master functions as the fundamental building blocks of your Haskell universe . Pattern matching lets functions respond differently based on input structure — matching literal values, Booleans, empty lists, and head-tail decomposition with (x:xs) — replacing complex conditionals with clear, readable definitions . Guards with the pipe symbol | create mathematical-style function definitions that handle multiple conditions elegantly, combining with where clauses for sophisticated calculations and Boolean logic . Function composition with the dot operator . builds data transformation pipelines where simple functions chain into powerful operations, reading right to left like mathematical notation . Lambda expressions with the backslash syntax \x -> x + 1 create anonymous functions on the fly, integrating seamlessly with map, filter, and foldr for expressive one-time transformations . Partial application and currying reveal that every Haskell function is automatically a chain of single-argument functions, letting you create specialized tools by supplying fewer arguments than expected . The course culminates with higher-order functions — map for transformation, filter for selection, and custom higher-order functions that accept and return functions — demonstrating why first-class functions make Haskell one of the most expressive languages in modern programming .
