Slices

Slice a vector

A slice is a borrowed view into part of a vector or array. A range inside brackets selects the start and end positions:

let v = vec![1, 2, 3, 4]; let s = &v[0..2];

Length

Both vectors and slices report size with len and emptiness with is_empty. Both calls borrow and never move data:

let v = vec![1, 2, 3]; let n = v.len(); let empty = v.is_empty();

Split at

Split at divides one slice into two parts at one index. The left part holds the start and the right part holds the rest:

let v = vec![1, 2, 3, 4]; let (a, b) = v.split_at(2);

Windows and chunks

Windows slides a small view across a slice, while chunks cuts it into fixed blocks. Both are ideal for grouped processing:

let v = vec![1, 2, 3, 4]; for w in v.windows(2) { println!("{}", w.len()); }

Next: if and else

Article author: Arthur Isaev