Concept
A partial reference of a contiguous sequence of elements in a collection.
- contiguous
- a data type that does not have ownership
Usage
String Slices
let s = String::from("hello world");
let hello = &s[0..5];
let world = &s[6..11];
Like others languages, we can simpify the syntax if we want to start at the first index(zero) or include the last byte of String
#![allow(unused)]
fn main() {
let s = String::from("hello");
let slice = &s[0..2];
let slice = &s[..2];
}
#![allow(unused)]
fn main() {
let s = String::from("hello");
let len = s.len();
let slice = &s[3..len];
let slice = &s[3..];
}
#![allow(unused)]
fn main() {
let s = String::from("hello");
let len = s.len();
let slice = &s[0..len];
let slice = &s[..];
}
Attention
- String slice range indices must occur at valid UTF-8 character boundaries.
- String literals are slices
- Using string slices as parameters usually make our API more general and useful without losing any functionality.
