Rust Cheat Sheet
Learn Rust's core syntax and programming constructs with a detailed cheat sheet covering variables, structures, enumerations, control flow, functions, matching, and iterators. This lesson helps you quickly reference Rust programming essentials needed for building games.
Variable assignment
| Code | Description |
|---|---|
let n = 5; |
Assign the value, 5, to n. The type of n is deduced. |
let n : i32 = 5; |
Assign the value, 5, to n. n is an i32. |
let n; |
Create a placeholder variable named n. We may assign to it (once) later. |
let mut n = 5; |
Assign the value, 5, to n. n is mutable and may be changed later. |
let n = i == 5; |
Assign the result of the expression, i==5 (true or false), to n. The type of n is deduced. |
x = y;. |
Move y’s value into x (you can no longer use y), unless y is a copyable type. If its type implements [derive(Copy)], a copy is made and y remains usable. |
Structures
| Code | Description |
|---|---|
struct S { x:i32 } |
Create a structure containing a field named x of type i32. Access as s.x. |
struct S (i32); |
Create a tuple structure containing an i32. Access as s.0. |
struct S; |
Create a unit structure that optimizes out of our code. |
Enumerations
| Code | Description |
|---|---|
enum E { A, B } |
Define an enumeration type with the options, A and B. |
enum E { A(i32), B } |
Define an enumeration type with A and B. A contains an i32. |