# Function core::iter::repeat

1.0.0 · source ·
``pub fn repeat<T: Clone>(elt: T) -> Repeat<T> ⓘ``
Expand description

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 `Iterator::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());``````
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Going finite with `Iterator::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());``````
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