EFSafeArray is an extension to make array subscript safe, nil will be return instead of crash if index is out of range, it works on iOS, macOS, watchOS and tvOS.

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

Requirements

Version	Needs
0.x	XCode 8.0+ Swift 3.0+ iOS 8.0+
4.x	XCode 9.0+ Swift 4.0+ iOS 8.0+
5.x	XCode 10.2+ Swift 5.0+ iOS 8.0+ / macOS 10.11+ / tvOS 9.0+ / watchOS 2.0+

Installation

CocoaPods

EFSafeArray is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'EFSafeArray'

Swift Package Manager

The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into the Swift compiler.

Once you have your Swift package set up, adding EFSafeArray as a dependency is as easy as adding it to the dependencies value of your Package.swift.

dependencies: [
    .package(url: "https://github.com/EFPrefix/EFSafeArray.git", .upToNextMinor(from: "5.1.2"))
]

Use

var list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
// Get Index
let xxx = list[0]               // xxx: Int = 1
let zzz = list[0~]              // zzz: Int? = 1
let yyy = list[10~]             // yyy: Int? = nil

// Set Index
list[0] = 0                     // list = [0, 2, 3, 4, 5, 6, 7, 8, 9, 0]
list[0~] = 1                    // list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
list[10~] = 10                  // list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]

// Get Bounds
let iiii = list[(0...5)~]       // iiii: ArraySlice<Int>? = [1, 2, 3, 4, 5, 6]
let oooo = list[(-1...12)~]     // oooo: ArraySlice<Int>? = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]

// Set Bounds
list[(0...5)~] = [1]            // list = [1, 7, 8, 9, 0]
list[(-1...12)~] = [2, 3, 4, 5] // list = [2, 3, 4, 5]

Author

EyreFree, eyrefree@eyrefree.org

License

EFSafeArray is available under the MIT license. See the LICENSE file for more info.