CODEWITHSUNDEEP
arraysswiftdictionary
Mark
Mark

Reputation: 621

Comparing two dictionary of arrays for equality

I have a dictionary of the following type

[String : [String]]

In my app, during runtime I make a request to update a var containing a dictionary of the above type. I also store the same type of dictionary in CoreData.

My question is what would be the best method to compare two of these dictionaries for equality? I was thinking that a hashing function would be best for this but not sure how to approach it

Upvotes: 2

Views: 651

Answers (2)

Brooks DuBois
Brooks DuBois

Reputation: 725

I believe this functionality is native to swift 4:

https://developer.apple.com/documentation/swift/dictionary/2430767

A function like this will work considering the compiler will check the type for you and guarantee a key:

func compare(left:[String:[String]], right: [String:[String]]) -> Bool {
     return left.keys == right.keys && left[left.keys.first!]! == right[right.keys.first!]! 
}

But if you want to loop through it for some reason, a good way would be declaratively.

Upvotes: 2

Enea Dume
Enea Dume

Reputation: 3232

I tried this example: 

var dict1: [String: [String]]!
var dict2: [String: [String]]!

func compareDictionaries(){
    if dict1 == dict2{
        print("equals")
    }
}

Upvotes: 1

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