You may be wondering what the _ parameter is. In Rust, it is often not allowed to omit variable bindings even if we don't use them. We can use _ to signify that we know that this place needs a variable binding, but we are never going to use it.
- Preface
- Introducing and Installing Rust
- Variables
- Variable mutability
- Summary
- Input and Output
- Conditions, Recursion, and Loops
- Remember, Remember
- Creating Your Own Rust Applications
- Matching and Structures
- The Rust Application Lifetime
- Introducing Generics, Impl, and Traits
- Creating Your Own Crate
- Concurrency in Rust
- Now It's Your Turn!
- The Standard Library
- Chapter format
- What is the standard library?
- The standard modules
- std::Any
- std::ascii
- std::borrow
- std::boxed
- std::cell
- std::char
- std::clone
- std::cmp
- std::collections
- std::convert
- std::default
- std:env
- std:error
- std::f32
- std::f64
- std:ffi
- std::fmt
- std::fs
- std::hash
- std::i8
- std::i16
- std::i32
- std::i64
- std::io
- std::isize
- std::iter
- std::marker
- std::mem
- std:net
- std::num
- std::os
- std::panic
- std::path
- std::process
- std::ptr
- std::slice
- std::str
- std::string
- std::sync
- std::thread
- std::time
- std::u8
- std::u16
- std::u32
- std::u64
- std::usize
- std::vec
- Summary
- Foreign Function Interfaces
- Introducing our simple library
- The three-step program
- Summary
The _ parameter
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