How to check whether an integer lies inside a range

Written by Paul Hudson    @twostraws

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

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