http://blog.krzyzanowskim.com/2015/10/24/chunksequence-have-cake-and-eat-it/

ChunkSequence.swift

// http://blog.krzyzanowskim.com

import Cocoa

struct ChunkSequence<Element>: SequenceType {
    let chunkSize: Array<Element>.Index
    let collection: Array<Element>

    func generate() -> AnyGenerator<ArraySlice<Element>> {
        var offset:Array<Element>.Index = collection.startIndex
        return anyGenerator {
            let result = self.collection[offset..<offset.advancedBy(self.chunkSize, limit: self.collection.endIndex)]
            offset += result.count
            return result.count > 0 ? result : nil
        }
    }
}

extension Array {
    func slice(every every: Index) -> ChunkSequence<Element> {
        return ChunkSequence(chunkSize: every, collection: self)
    }
}

var 🎂 = ["🍰","🍰","🍰","🍰","🍰"]
for 🍰 in 🎂.slice(every: 2) {
    print(🍰)
}

var array:Array<Int> = [1,2,3,4,5]
for slice in array.slice(every: 2) {
    print(slice)
}