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Update iter_find.md #1512

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Feb 28, 2022
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Update iter_find.md #1512

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9 changes: 6 additions & 3 deletions src/fn/closures/closure_examples/iter_find.md
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Original file line number Diff line number Diff line change
Expand Up @@ -53,11 +53,14 @@ item, use `Iterator::position`.
fn main() {
let vec = vec![1, 9, 3, 3, 13, 2];

let index_of_first_even_number = vec.iter().position(|x| x % 2 == 0);
// `iter()` for vecs yields `&i32` and `position()` does not take a reference, so
// we have to destructure `&i32` to `i32`
let index_of_first_even_number = vec.iter().position(|&x| x % 2 == 0);
assert_eq!(index_of_first_even_number, Some(5));


let index_of_first_negative_number = vec.iter().position(|x| x < &0);
// `into_iter()` for vecs yields `i32` and `position()` does not take a reference, so
// we do not have to destructure
let index_of_first_negative_number = vec.into_iter().position(|x| x < 0);
assert_eq!(index_of_first_negative_number, None);
}
```
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