CODEWITHSUNDEEP
iosarraysswift
user3711175
user3711175

Reputation: 109

Swift search value for the nearest similar value reagrdless of sequence

Hi guys I want to ask how do you search the items for the nearest possible similar value regarding of the sequence. Example as below when I search for ["Restaurant","Bull"], it should return me str2 is the possible nearest values. Because this function only able to work for order sequence, it cannot for non-sequence. I really hope you guys can help me out....

 func search(`for` searchItems: Set<String>, `in` searchArea: [Set<String>]) -> Set<String>? {
            return searchArea.max(by: { (a, b) -> Bool in
                return searchItems.intersection(a).count < searchItems.intersection(b).count || searchItems.intersection(a).count > searchItems.intersection(b).count
            })
        }        


            let str2: Set<String> = ["Bull","Restaurant","Corner"]
            let str3: Set<String> = ["Corner","Restaurant","Mole"]

            let area = [str3, str2] as [Any]

            print("search result",self.search(for: ["Restaurant","Bull"], in: area as! [Set<String>]))

Upvotes: 0

Views: 106

Answers (2)

Tj3n
Tj3n

Reputation: 9943

Probably because your str2 and str3 is not Set at all, it's array coz you are using array declaration, thus change it to this then it works if you use ["Bull", "Restaurant"]:

let str2 = Set(["Bull","Restaurant","Corner"])
let str3 = Set(["Corner","Restaurant","Mole"])

Also, Set is non-ordered sequence, Array is ordered sequence

Upvotes: 1

Mr. Hedgehog
Mr. Hedgehog

Reputation: 986

Just make a set out of your query array and use its isSubset(of:) method to check wether it's a subset of your data.

let set1 = Set([1,2,3])
let set2 = Set([2,3,4])

let query = [1,2]
let querySet = Set(query)

querySet.isSubset(of: set1) // true
querySet.isSubset(of: set2) // false

let query2 = [2,1]
let querySet2 = Set(query)

querySet2.isSubset(of: set1) // true
querySet2.isSubset(of: set2) // false

Upvotes: 0

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