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weekly 2023-11-27

· 2 min read

In November 2023, MoonBit underwent Alpha testing. This post aims to introduce recent updates to MoonBit's language and toolchain, along with applications developed using MoonBit.

Changes in MoonBit Language

1. Support for deriving Eq, Compare, Show, and Default in struct and enum.

struct T {
x: Int
y: Int
} derive(Eq, Show, Compare, Default)

fn init {
let t0 = T::default()
let t1 = { x : 1, y : 1 }
println(t0 < t1)
println(t0 == t1)

// {x: 0, y: 0}
// {x: 1, y: 1}
// true
// false

Related documentation link:

2. Command-line tool supports printing UTF-8 strings.


3. Allow the use of _ to ignore unused variable warnings.



4. More user-friendly error messages

More user-friendly error messages: attempting to give FFI declarations type parameters will result in an error.

Last week, the MoonBit Gallery added a Mario game where, in a real-time programming environment, you can flexibly adjust Mario's jumping height, create multiple Mario characters. Additionally, you can dynamically change the game's ending logic, offering a whole new gaming experience. Here's the link to the game: MoonBit Gallery | MoonBit (, come and try it out!