Rust functions: Difference between revisions
From wikinotes
Line 36: | Line 36: | ||
<syntaxhighlight lang="rust"> | <syntaxhighlight lang="rust"> | ||
// return void | // return void | ||
fn foo() { | fn foo() { | ||
println!("hi"); | println!("hi"); | ||
} | } | ||
Line 49: | Line 49: | ||
(123, String::from("abc")) | (123, String::from("abc")) | ||
} | } | ||
</syntaxhighlight> | |||
Notes that rust supports unpacking multiple variables. | |||
<syntaxhighlight lang="rust"> | |||
fn foo() -> (i32, String) { | |||
(123, String::from("abc")) | |||
} | |||
let (mynum, mystr) = foo(); | |||
</syntaxhighlight> | </syntaxhighlight> | ||
</blockquote><!-- Return Values --> | </blockquote><!-- Return Values --> | ||
</blockquote><!-- Function Signatures --> | </blockquote><!-- Function Signatures --> |
Revision as of 17:05, 7 February 2023
Expressions vs Statements
- statements include actions without a return value (ends in ;)
- expressions include actions with a return value (no ;)
statement
{ let y = 1; y += 1; } // no return valexpression
let x = { let y = 1; y += 1 // <-- no semicolon } // returns 2
Function Signatures
Params
fn main(num: u8) { println!("{}", num); }Return Values
// return void fn foo() { println!("hi"); } // single return value fn foo() -> i32 { 123 // <-- return value (no semicolon) } // multiple return values fn foo() -> (i32, String) { (123, String::from("abc")) }Notes that rust supports unpacking multiple variables.
fn foo() -> (i32, String) { (123, String::from("abc")) } let (mynum, mystr) = foo();