How to initialize a two-dimentional array in Swift 2?

Question

Is there a single line equivalent for this Java code used to create a 2d array:

cells = new Cell[width][height];

in Swift 2.0?

Looking at various solutions here in Stack Overflow I have ended up with a multi-line monster of:

self.cells = [[Cell]]()
for (var col=0; col<height; col++){
    var newColumn = Array<Cell>.init(count: width, repeatedValue: Cell(x: 0,y: 0))
    self.cells.append(newColumn);
}

which creates an empty array for me. But I am quite sure that's not the right solution, just a duct tape kind of workaround.

Eric Aya · Accepted Answer · 2015-09-23 09:50:40Z

3

No need to use a loop:

let inner = Array<Cell>(count: width, repeatedValue: Cell(x: 0,y: 0))
let cells = Array<[Cell]>(count: height, repeatedValue: inner)

It could be a one-liner of course:

let cells = Array<[Cell]>(count: height, repeatedValue: Array<Cell>(count: width, repeatedValue: Cell(x: 0,y: 0)))

But I prefer having separate statements for readability.

answered Sep 23, 2015 at 9:50

Eric Aya

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1 Comment

Piotr Over a year ago

indeed the one liner is a mammoth size of statement :) will use the neat two lines version

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