# Function core::iter::repeat [−] [src]

    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 and over and over and over and 🔁.

Infinite iterators like `repeat()` are often used with adapters like `take()`, in order to make them finite.

# Examples

Basic usage:

fn main() { 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()); }

    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());

Going finite with `take()`:

fn main() { 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()); }

    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());

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