Skip to main content

Variables

The video for “Variables” is in the works!

Variables store data that your program can use and modify.

Declaring Variables​

Mux has explicit typing with type inference. You can declare variables with explicit types or let Mux infer the type:

Try it yourself
Loading...
Ctrl + Enter to run

When to Use Explicit Types​

The auto keyword works well when the type is obvious from the value:

  • auto name = "Mux" - string inferred
  • auto count = 42 - int inferred
  • auto numbers = [1, 2, 3] - type inferred from contents

Some cases require an explicit type because the type can't be inferred:

  • Empty collections: auto empty = [] (error - can't infer element type)
  • Use explicit types: List<int> numbers = [], Map<string, int> ages = {}
Try it yourself
Loading...
Ctrl + Enter to run

Constants​

Use const to declare values that never change:

Try it yourself
Loading...
Ctrl + Enter to run

Incrementing and Decrementing​

Variables can be incremented or decremented using ++ and --:

Try it yourself
Loading...
Ctrl + Enter to run

Previous: Hello World | Next: Basic Types