F#

When to Use

• Financial Tech: Correctness and domain modeling.
• Data Processing: Pipeline operator

  |>

  and immutability by default.
• Interpro: Seamlessly use any NuGet package.

Core Concepts

Discriminated Unions

type Shape = Circle of float | Rect of float * float

Pipe Operator

data |> filter |> map

Computation Expressions

async { ... }

task { ... }

Best Practices (2025)

• Use Records: Immutable data containers.
• Use Pattern Matching:

  match x with ...

  .
• Use

  SAFE Stack

  : For full-stack F# web apps (Saturn, Azure, Fable, Elmish).

• Don't mimic C#: Avoid classes/inheritance unless interoperating.

References

• F# Guide