Error: Immutable value passed on reduce function

Question

I\'m trying to do the following code that transforms an array of tuples into a dictionary but I\'m receiving a compile error saying:

Immutable value

Answer 1

You can simply make the dictionary parameter mutable by preceding it with var:

var final = array.reduce(initial) { (var dictionary, tuple) in
                                     ^^^

Note however that using reduce a new dictionary is created at each iteration, making the algorithm very inefficient. You might want to consider using a traditional foreach loop

Answer 2

Swift 4 has a new variant:

var array = [("key0", "value0"), ("key1", "value1")]
var initial = [String: String]()
var final = array.reduce(into: initial) { dictionary, tuple in
    dictionary[tuple.0] = tuple.1
}

Which could be expressed:

var array = [("key0", "value0"), ("key1", "value1")]
let final: [String: String] = array.reduce(into: [:]){ $0[$1.0] = $1.1 }

Answer 3

On Swift 3:

var final = array.reduce(initial) { (dictionary, tuple) -> [String: String] in
    var mutableDictionary = dictionary
    //.... make changes with mutableDictionary
    return mutableDictionary
}