How Do I … in Rust?

Discovery

… find a crate for a given purpose?

… find the latest version of a crate?

Project organization

… organize a Rust workspace?

Conveniences

… define "extension" methods on a type in another crate?

… guarantee a trait is object-safe?

static_assertions::assert_obj_safe!(MyTrait);

Error handling and debugging

… handle errors simply and correctly?

… structure errors in a public API?

… set up basic logging?

Collections

… create a fast HashMap?

… convert from slices to fixed-length arrays?

Numerics

… convert between numeric types ideomatically?

… perform math ideomatically?

… convert between ints and bytes?

Encoding, serialization, parsing

… serialize to and from JSON?

… decide what format to use with serde?

Time

… parse and render standard time formats?

Random numbers

… generate a strong random number?

… generate a strong random number from a seed?

… generate a fast random number from a seed?

Cryptography

… calculate a cryptographic content hash?

Parallelism and Concurrency

… initialize a global value?

todo LazyLock, OnceLock, and Once.

… send messages to/from async code?

todo futures::channels

Asynchronous I/O

… set up the tokio event loop?

… stub an unwritten async fn?

Networking and web

… make a synchronous HTTP request?

… configure a basic HTTP server?

Text / unicode

Terminal / CLI

… set up a simple CLI parser with subcommands?

… display colors in the terminal?

… read line-based input from the terminal?

System / OS

… read environment variables?

… work with a temporary file?

… work with multiple files in a temporary directory?

Testing

… create a custom test harness?

… create a custom table-based test harness?

Build scripts

… write build scripts ideomatically?

… link to a native static library?

… compile and link a C source file?

FFI / interop

… create Rust bindings to a C/C++ program?

Procedural macros