---
title: "stride(from:to:by:)"
framework: swift
role: symbol
role_heading: Function
path: "swift/stride(from:to:by:)"
---

# stride(from:to:by:)

Returns a sequence from a starting value to, but not including, an end value, stepping by the specified amount.

## Declaration

```swift
func stride<T>(from start: T, to end: T, by stride: T.Stride) -> StrideTo<T> where T : Strideable
```

## Parameters

- `start`: The starting value to use for the sequence. If the sequence contains any values, the first one is start.
- `end`: An end value to limit the sequence. end is never an element of the resulting sequence.
- `stride`: The amount to step by with each iteration. A positive stride iterates upward; a negative stride iterates downward.

## Return Value

Return Value A sequence from start toward, but not including, end. Each value in the sequence steps by stride.

## Discussion

Discussion You can use this function to stride over values of any type that conforms to the Strideable protocol, such as integers or floating-point types. Starting with start, each successive value of the sequence adds stride until the next value would be equal to or beyond end. for radians in stride(from: 0.0, to: .pi * 2, by: .pi / 2) {     let degrees = Int(radians * 180 / .pi)     print("Degrees: \(degrees), radians: \(radians)") } // Degrees: 0, radians: 0.0 // Degrees: 90, radians: 1.5707963267949 // Degrees: 180, radians: 3.14159265358979 // Degrees: 270, radians: 4.71238898038469 You can use stride(from:to:by:) to create a sequence that strides upward or downward. Pass a negative value as stride to create a sequence from a higher start to a lower end: for countdown in stride(from: 3, to: 0, by: -1) {     print("\(countdown)...") } // 3... // 2... // 1... If you pass a value as stride that moves away from end, the sequence contains no values. for x in stride(from: 0, to: 10, by: -1) {     print(x) } // Nothing is printed.

## See Also

### Strides

- [stride(from:through:by:)](swift/stride(from:through:by:).md)