get: Borrow an Element

Getting an element from a collection or container.

# // Copyright 2025 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
impl <T> Vec<T> {
    fn get(&self, index: usize) -> Option<&T> {...}
}

impl <T> OnceCell {
    fn get(&self) -> Option<&T> {...}
}

Immutable by default, for the most part.

Should not panic. May return an option or result, depending on the framework.

• Not for fields!

  For private fields you don't want users to have direct, assign a method with a more descriptive name (or the same name as the field) is preferred.