Vectors

Create and push

Vec<T> owns a heap-allocated list.

let mut nums = Vec::new();
nums.push(10);
nums.push(20);
println!("{:?}", nums);

Use a macro literal

vec! builds a vector quickly.

let nums = vec![1, 2, 3];
println!("{}", nums[1]);

Iterate

Borrow elements with a for loop.

for n in &nums {
    println!("{n}");
}

Vector safety

• Indexing past the end panics
• Prefer .get(i) which returns Option
• Ownership moves out of a vector unless you clone or copy
• Store references only when lifetimes allow