# ..<(_:)

Returns a partial range up to, but not including, its upper bound.

Available because

`Self`

conforms to`Comparable`

.

`static func ..< (maximum: Self) -> PartialRangeUpTo<Self>`

## Parameters

- maximum
The upper bound for the range.

## Overview

Use the prefix half-open range operator (prefix `..<`

) to create a partial range of any type that conforms to the `Comparable`

protocol. This example creates a `PartialRangeUpTo<Double>`

instance that includes any value less than `5.0`

.

```
let upToFive = ..<5.0
upToFive.contains(3.14) // true
upToFive.contains(6.28) // false
upToFive.contains(5.0) // false
```

You can use this type of partial range of a collection’s indices to represent the range from the start of the collection up to, but not including, the partial range’s upper bound.

```
let numbers = [10, 20, 30, 40, 50, 60, 70]
print(numbers[..<3])
// Prints "[10, 20, 30]"
```