Searching through iterators
Iterator::find
is a function which iterates over an iterator and searches for the
first value which satisfies some condition. If none of the values satisfy the
condition, it returns None
. Its signature:
pub trait Iterator {
// The type being iterated over.
type Item;
// `find` takes `&mut self` meaning the caller may be borrowed
// and modified, but not consumed.
fn find<P>(&mut self, predicate: P) -> Option<Self::Item> where
// `FnMut` meaning any captured variable may at most be
// modified, not consumed. `&Self::Item` states it takes
// arguments to the closure by reference.
P: FnMut(&Self::Item) -> bool;
}
Iterator::find
gives you a reference to the item. But if you want the index of the
item, use Iterator::position
.