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›Advanced Features

Intro

  • What & Why

Setup

  • Installation
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Language Basics

  • Overview
  • Let Bindings
  • Primitives
  • Basic Structures
  • Types
  • Records
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  • Options and nullability
  • Functions
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  • Pattern Matching
  • Mutable Bindings
  • Loops
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Advanced Features

  • JSX
  • External
  • Exception
  • Object

JavaScript

  • Interop
  • Syntax Cheatsheet
  • Pipe First
  • Promise
  • Libraries
  • Converting from JS

Extra

  • Frequently Asked Questions
  • Extra Goodies
Translate

External

external, o "FFI" (foreign function interface) o simplemente "interop" (de "interoperabilidad") es cómo Reason se comunica con otros lenguajes, como C o JavaScript.

Imagina escribir un enlace let, pero omitiendo su cuerpo y escribiendo su tipo (obligatorio):

external myCFunction: int => string = "theCFunction";

Note: externals can only be at the top level, or inside a module definition. You can't declare them in e.g. a function body.

Uso

You'd use an external value/function as if it was a normal let binding.

For more infos on how to link up your C functions within your Reason application, have a look at the Dealing with foreign libraries section in the dune build system docs.

← JSXException →
  • Uso