Swift - Convert Array to Dictionary

Question

I just want convert an array of Player Names into a dictionary Scoreboard, giving everyone an initial score of 0.

Meaning...

var playerNames =          


        

Answer 1

If the player names are known to be all different then you can do

let playerNames = ["Harry", "Ron", "Hermione", "Ron"]

var scoreBoard = Dictionary(uniqueKeysWithValues: zip(playerNames,
                                                      repeatElement(0, count: playerNames.count)))

print(scoreBoard) // ["Harry": 0, "Ron": 0, "Hermione": 0]

Here zip is used to create a sequence of player/score pairs, from which the dictionary is created.

Remark: Originally I had used AnySequence { 0 } to generate the zeros. Using repeatElement() instead was suggested by Alexander and has the advantage that the correct required capacity is passed to the dictionary intializer.