Swift 2.0 Check if multi-dimensional array contains specific arrays

Question

I have a set of correct combinations like following

[["dbc", "dbs", "dbt"], ["dyc", "dys", "dyt"], ["drc", "drs", "drt"]]

and was hoping to see if my combinations contain any of correct combination when my combinations are

[["drs", "gbc", "lrs"], ["grt", "lbc", "lbt"], ["drc", "drs", "drt"], ["dyc", "dys", "dyt"]]

If there are any matches, then print out correct combination.

I've tested .contains, but I guess it only works with finding one element in one-dimensional array. How can I check if multi-dimensional array contains specific arrays?

Luca Angeletti · Accepted Answer · 2015-10-03 22:15:44Z

2

So, in other terms, you have 2 lists of elements (where an element is an array of 3 strings) and you want to find the intersection of the 2 lists.

let corrects : Set = [["dbc", "dbs", "dbt"], ["dyc", "dys", "dyt"], ["drc", "drs", "drt"]]
let all : Set = [["drs", "gbc", "lrs"], ["grt", "lbc", "lbt"], ["drc", "drs", "drt"], ["dyc", "dys", "dyt"]]

let intersection = Array(corrects.intersect(all))

intersection // [["dyc", "dys", "dyt"], ["drc", "drs", "drt"]]

Hope this helps

P.S. The logic of my answer is similar of the one described by egor.zhdan. I'm just using the Swift native Set struct instead of the NSSet/NSMutableSet classes bridged from Objective-C.

edited Oct 3, 2015 at 22:15

answered Oct 3, 2015 at 22:08

Luca Angeletti

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Comments

egor.zhdan · Accepted Answer · 2015-10-03 20:41:40Z

0

You can do it with NSMutableSet and intersectSet method:

let correct = [["dbc", "dbs", "dbt"], ["dyc", "dys", "dyt"], ["drc", "drs", "drt"]]
let all = [["drs", "gbc", "lrs"], ["grt", "lbc", "lbt"], ["drc", "drs", "drt"], ["dyc", "dys", "dyt"]]

let correctSet = NSSet(array: correct)
let allSet = NSMutableSet(array: all)
allSet.intersectSet(correctSet as Set<NSObject>)

print(allSet) // prints (("drc", "drs", "drt"), ("dyc", "dys", "dyt"))

answered Oct 3, 2015 at 20:41

egor.zhdan

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