Convert Swift Array to Dictionary with indexes [duplicate]

by

try like this:

reduce(enumerate(a), [String:UIView]()) { (var dict, enumeration) in
    dict["\(enumeration.index)"] = enumeration.element
    return dict
}

Xcode 8 • Swift 2.3

extension Array where Element: AnyObject {
    var indexedDictionary: [String:Element] {
        var result: [String:Element] = [:]
        for (index, element) in enumerate() {
            result[String(index)] = element
        }
        return result
    }
}

Xcode 8 • Swift 3.0

extension Array  {
    var indexedDictionary: [String: Element] {
        var result: [String: Element] = [:]
        enumerated().forEach({ result[String($0.offset)] = $0.element })
        return result
    }
}

Xcode 9 – 10 • Swift 4.0 – 4.2

Using Swift 4 reduce(into:) method:

extension Collection  {
    var indexedDictionary: [String: Element] {
        return enumerated().reduce(into: [:]) { $0[String($1.offset)] = $1.element }
    }
}

Using Swift 4 Dictionary(uniqueKeysWithValues:) initializer and passing a new array from the enumerated collection:

extension Collection {
    var indexedDictionary: [String: Element] {
        return Dictionary(uniqueKeysWithValues: enumerated().map{(String($0),$1)})
    }
}

More Related Contents:

  1. The “++” and “–” operators have been deprecated Xcode 7.3
  2. try, try! & try? what’s the difference, and when to use each?
  3. print without newline in swift
  4. How do you enumerate OptionSetType in Swift?
  5. Whats the Swift animate WithDuration syntax?
  6. Waiting until the task finishes
  7. round trip Swift number types to/from Data
  8. Swift: guard let vs if let
  9. .toInt() removed in Swift 2?
  10. What is the ‘open’ keyword in Swift?
  11. Non-‘@objc’ method does not satisfy optional requirement of ‘@objc’ protocol
  12. Differences in NSDateComponents syntax?
  13. Shuffle array swift 3
  14. Swift 2 ( executeFetchRequest ) : error handling
  15. What is a good example to differentiate between fileprivate and private in Swift3
  16. Swift 3 for loop with increment
  17. Swift 2 – Pattern matching in “if”
  18. Express for loops in swift with dynamic range
  19. Extend array types using where clause in Swift
  20. What happened to the UIView?() constructor in Swift 3.0?
  21. Calling protocol default implementation from regular method
  22. How flatMap API contract transforms Optional input to Non Optional result?
  23. Swap rootViewController with animation?
  24. Generic function taking a type name in Swift
  25. Selecting global or object print function
  26. Whither dispatch_once in Swift 3?
  27. Swift 2.0 : ‘enumerate’ is unavailable: call the ‘enumerate()’ method on the sequence
  28. Xcode 8 / Swift 3 : Simple UIPicker code not working
  29. Iterate through a String Swift 2.0
  30. How to convert a binary to decimal in Swift?

Leave a Comment