How to check whether an integer lies inside a range

Swift version: 5.1

Paul Hudson    @twostraws    May 28th 2019

All Swift’s ranges come with a built-in contains() method that lets us check whether one value lies inside or outside the range. For example, given this range:

let passRange = 85...100

And this integer:

let score = 88

We can check whether score lies inside passRange using contains(), like this:

if passRange.contains(score) {
    print("You passed the test!")
} else {
    print("Better luck next time.")
}

Available from iOS 8.0

Similar solutions…

• How to check whether a date is inside a date range
• How to split an integer into an array of its digits
• Using stride() to loop over a range of numbers
• How to check whether a string contains any words from an array
• How to check whether one date is similar to another

About the Swift Knowledge Base

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