1.0.0[−][src]Function core::iter::repeat
ⓘImportant traits for Repeat<A>
pub fn repeat<T: Clone>(elt: T) -> Repeat<T>
Creates a new iterator that endlessly repeats a single element.
The repeat()
function repeats a single value over and over again.
Infinite iterators like repeat()
are often used with adapters like
take
, in order to make them finite.
If the element type of the iterator you need does not implement Clone
,
or if you do not want to keep the repeated element in memory, you can
instead use the repeat_with
function.
Examples
Basic usage:
use std::iter; // the number four 4ever: let mut fours = iter::repeat(4); assert_eq!(Some(4), fours.next()); assert_eq!(Some(4), fours.next()); assert_eq!(Some(4), fours.next()); assert_eq!(Some(4), fours.next()); assert_eq!(Some(4), fours.next()); // yup, still four assert_eq!(Some(4), fours.next());Run
Going finite with take
:
use std::iter; // that last example was too many fours. Let's only have four fours. let mut four_fours = iter::repeat(4).take(4); assert_eq!(Some(4), four_fours.next()); assert_eq!(Some(4), four_fours.next()); assert_eq!(Some(4), four_fours.next()); assert_eq!(Some(4), four_fours.next()); // ... and now we're done assert_eq!(None, four_fours.next());Run