How to Define an Optional Array with a Fixed Size [Swift 3]

Question

I'm trying to define an array of objects. The array needs to have 3 spaces. At the variable initialization, they're set to nil, but later on in the program, they're filled in (they're filled in before they're used).

Here's what I have so far:

var scrollLayers: [SKNode?]! = [nil, nil, nil]

And this works fine, but if I have, for example, 50 spots that need to be initialized, I don't want to have to type "nil, " 50 times. Is there a way to make this array 50 spots big and have all those spots set to nil?

Thanks, Matthew

Yet another documentation fail. "If you need an array that is preinitialized with a fixed number of default values..." It doesn't get any plainer. — matt
– matt, Commented Dec 4, 2016 at 3:16
@matt Thanks for the link to the docs! If I'm going to be honest with you, I didn't even know this documentation existed. I'm super new to Swift programming despite, and several google searches, I couldn't figure it out. Thanks again :) — Mattkx4
– Mattkx4, Commented Dec 4, 2016 at 4:41

nshoute · Accepted Answer · 2016-12-04 02:54:25Z

9

var scrollLayers = [SKNode?](repeating: nil, count: 50)

answered Dec 4, 2016 at 2:54

nshoute

2371 silver badge3 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Dani Pralea Over a year ago

any option for non-optional values?

nshoute Over a year ago

You can't initialize a non-optional array with optionals, but you can do this: var threeDoubles = [Double](repeating: 0.0, count: 3)

tetsuo · Accepted Answer · 2017-10-09 17:09:38Z

1

For those that prefer this syntax:

var scrollLayers: [SKNode?] = Array(repeating: nil, count: 50)

answered Oct 9, 2017 at 17:09

tetsuo

618 bronze badges

Collectives™ on Stack Overflow

How to Define an Optional Array with a Fixed Size [Swift 3]

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related