Functional programming requires unlearning imperative habits to gain benefits like statelessness, which reduces side effects and cognitive load.
Functional programming treats functions like mathematical operations that always produce the same output for a given input without side effects.
F# uses `let` for redefinition instead of assignment and enforces a top-to-bottom file order for dependencies, simplifying code analysis.
The Fable REPL provides an in-browser environment to write F# that compiles to JavaScript, enabling quick prototyping without local installation.
The pipeline operator (`|>`) transforms sequential, imperative steps into a declarative data flow by passing the output of one function to the input of the next.
Replacing primitive types like strings with discriminated unions creates a more robust and type-safe domain model that prevents invalid states at compile time.
New features can be added by creating new functions and types that wrap existing logic, minimizing the risk of breaking tested, stable code.
The built-in `Result` type (`Ok` or `Error`) provides an explicit way to handle operations that can fail, avoiding exceptions for control flow.
The composition operator (`>>`) combines multiple smaller functions into a single, larger function, creating reusable middleware for complex pipelines.
F# is used to build complex, real-world applications like a 3D bin packer and a full-stack pizza ordering app with a Blazor-like UI and WebSockets.
The discussion covers the benefits of append-only coding, debugging with source maps, and recommended IDEs like VS Code with the Ionide extension.
25:29Jemima Abu
27:27Stefan Schöberl
46:08Simon Painter
26:54Jonathan Müller
28:48Georg Dresler
32:56Laurie Voss
48:56Tal Joffe
43:02Tobias Schröder
Jobs that call for the skills explored in this talk.
doinstruct Software GmbH
Berlin, Germany
CONTIAMO GMBH
Berlin, Germany
Peter Park System GmbH
München, Germany
Famoco
Paris, France