How to use Iterator position and find

Use the position method to find the index of the first element matching a condition, or find to get the element itself.

let numbers = vec![1, 2, 3, 4, 5];
let index = numbers.iter().position(|&x| x > 3);
let value = numbers.iter().find(|&&x| x > 3);

position returns Option<usize> (the index), while find returns Option<&T> (a reference to the value).

Think of an iterator as a conveyor belt of items. The position method tells you the number of the spot where a specific item is located, while find hands you the item itself. You use these when you need to locate data inside a list without writing a manual loop.