Array.subscript(safe:) -> T?

Originator:robnapier
Number:rdar://21403129 Date Originated:16-Jun-2015 12:23 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Swift 2b1
Classification:Enhancement Reproducible:Always
 
Array should offer a “safe” version of subscript.

// Thanks Mike Ash
extension Array {
    subscript (safe index: Int) -> Element? {
        return Int(index) < count ? self[Int(index)] : nil
    }
}

Comments

Nice. However, array[safe: -1] will fail. Checking for indices.contains(index) will be safer.

By mzannone at June 17, 2015, 10:08 p.m. (reply...)

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