Compare multiple variables to the same expression

Question

I am trying to compare multiple variables to an expression, like so:

if 1 <= x && x <= 5 &&
    1 <= y && y <= 5 &&
    1 <= z && z <= 5 {
    // Code to run if true
}

I found a question related to comparing a variable to multiple specific values, which is not what I want because it is not a comparison in an inequality.

Is there any way I can shorten this, in any way?

For example making an inequality like 1 <= x && x <= 5 shortened, or making me able to compare x, y, and z easily in other ways?

Answer 1

Use ranges!

if (1...5).contains(x) &&
   (1...5).contains(y) &&
   (1...5).contains(z) {

}

Alternatively, create a closure that checks whether something is in range:

let inRange: (Int) -> Bool = (1...5).contains
if inRange(x) && inRange(y) && inRange(z) {

}

As Hamish has suggested, the allSatisfy method in Swift 4.2 can be implemented as an extension like this:

extension Sequence {
    func allSatisfy(_ predicate: (Element) throws -> Bool) rethrows -> Bool {
        return try !contains { try !predicate($0) }
    }
}