Rust variables: Difference between revisions
From wikinotes
Line 34: | Line 34: | ||
<syntaxhighlight lang="rust"> | <syntaxhighlight lang="rust"> | ||
let mut | let mut age: i8 = 30; | ||
age += 1; | |||
</syntaxhighlight> | </syntaxhighlight> | ||
</blockquote><!-- Mutability --> | </blockquote><!-- Mutability --> |
Revision as of 00:10, 7 September 2021
Assignment
let age: u8 = 200; // typed let age = 200u8; // type-suffix let age = 200; // implied type
Literals
Literal types can be declared without assigning a type.
let float = 3.14; // f64 let integer = 7; // i32
Constants
Constants can be declared in any scope (including global).
constants cannot be changed once assigned.const SALT: &str = "$6$r1ohStL5/UwpNnls"; static RETRIES: i8 = 5;
Mutability
All variables are immutable by default in rust.
You can make them mutable with themut
modifier.let mut age: i8 = 30; age += 1;
Introspection
TODO:
learn
// use std::any::type_name; (todo - learn)