# ClosedRange

An interval from a lower bound up to, and including, an upper bound.

`@frozen struct ClosedRange<Bound> where Bound : Comparable`

## Overview

You create a `ClosedRange`

instance by using the closed range operator (`...`

).

`let throughFive = 0...5`

A `ClosedRange`

instance contains both its lower bound and its upper bound.

```
throughFive.contains(3)
// true
throughFive.contains(10)
// false
throughFive.contains(5)
// true
```

Because a closed range includes its upper bound, a closed range whose lower bound is equal to the upper bound contains that value. Therefore, a `ClosedRange`

instance cannot represent an empty range.

```
let zeroInclusive = 0...0
zeroInclusive.contains(0)
// true
zeroInclusive.isEmpty
// false
```

### Using a Closed Range as a Collection of Consecutive Values

When a closed range uses integers as its lower and upper bounds, or any other type that conforms to the `Strideable`

protocol with an integer stride, you can use that range in a `for`

-`in`

loop or with any sequence or collection method. The elements of the range are the consecutive values from its lower bound up to, and including, its upper bound.

```
for n in 3...5 {
print(n)
}
// Prints "3"
// Prints "4"
// Prints "5"
```

Because floating-point types such as `Float`

and `Double`

are their own `Stride`

types, they cannot be used as the bounds of a countable range. If you need to iterate over consecutive floating-point values, see the `stride(from:through:by:)`

function.