rustHow to extend a Rust slice?

A Rust slice can be extended using the extend() method. This method takes an iterator as an argument and appends each element of the iterator to the slice.

let mut v = vec![1, 2, 3];
let mut s = &mut v[..];
s.extend([4, 5].iter());

println!("{:?}", s);

Output example

[1, 2, 3, 4, 5]

The code above creates a vector v with elements 1, 2, and 3. A mutable slice s is created from the vector. The extend() method is then used to append the elements 4 and 5 to the slice. The output of the code is [1, 2, 3, 4, 5].

Parts of the code:

• let mut v = vec![1, 2, 3];: creates a vector v with elements 1, 2, and 3.
• let mut s = &mut v[..];: creates a mutable slice s from the vector v.
• s.extend([4, 5].iter());: uses the extend() method to append the elements 4 and 5 to the slice s.

Helpful links

• Rust Documentation - Slices
• Rust Documentation - Iterator

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