Crates/Once Cell

How to Use Once and OnceLock for One-Time Initialization Use OnceLock for safe, thread-safe one-time initialization that returns a reference to the initialized value. How to use once_cell and LazyLock for one-time initialization Use std::sync::LazyLock for thread-safe one-time initialization in Rust 1.94.0+ or once_cell for older versions. How to use once_cell crate in Rust lazy initialization Use `once_cell::sync::Lazy` to define static variables that compute their value only on first access for efficient lazy initialization.