NEW: Join my free 100 Days of SwiftUI challenge today! >>

Using stride() to loop over a range of numbers

Swift version: 5.1

Paul Hudson    @twostraws   

Swift has a helpful stride(), which lets you move from one value to another using any increment – and even lets you specify whether the upper bound is exclusive or inclusive.

First, some examples. This first example counts from 0 to 10 in 2s:

for i in stride(from: 0, to: 10, by: 2) {
    print(i)
}

This second example counts from 0.1 up to to 0.5, exclusive:

for i in stride(from: 0, to: 0.5, by: 0.1) {
    print(i)
}

Both those examples use stride(from:to:by:), which counts from the start point up to by excluding the to parameter. If you want to count up and including the to parameter, you should use stride(from:through:by:), like this:

for i in stride(from: 0, through: 10, by: 2) {
    print(i)
}

LEARN SWIFTUI FOR FREE I have a massive, free SwiftUI video collection on YouTube teaching you how to build complete apps with SwiftUI – check it out!

Available from iOS 7.0

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!