moonbit-lang

# MoonBit Language Reference @reference/index.md @reference/introduction.md @reference/fundamentals.md @reference/methods.md @reference/derive.md @reference/error-handling.md @reference/packages.md @reference/tests.md @reference/benchmarks.md @reference/docs.md @reference/attributes.md @reference/ffi.md @reference/async-experimental.md @reference/error_codes/index.md @reference/toml-parser-parser.mbt ## Official Packages MoonBit has official packages maintained by the team: - **moonbitlang/x**: Utilities including file I/O (`moonbitlang/x/fs`) - **moonbitlang/async**: Asynchronous runtime with TCP, HTTP, async queues, async test, and async main To use these packages: 1. Add the dependency: `moon add moonbitlang/x` or `moon add moonbitlang/async` 2. Import the specific subpackage in `moon.pkg.json`: ```json {"import": ["moonbitlang/x/fs"]} ``` ## Common Pitfalls - Use `suberror` for error types, `raise` to throw, `try! func() |> ignore` to ignore errors - Use `func() |> ignore` not `let _ = func()` - When using `inspect(value, content=expected_string)`, don't declare a separate `let expected = ...` variable - it causes unused variable warnings. Put the expected string directly in the `content=` parameter - Use `!condition` not `not(condition)` - Use `f(value)` not `f!(value)` (deprecated) - Use `for i in 0..<n` not C-style `for i = 0; i < n; i = i + 1` - Use `if opt is Pattern(v) { ... }` for single-branch matching, not `match opt {}` - Use `arr.clear()` not `w...