Array of dictionary comparision - swift3 - ios

Question

I have 2 array of dictionaries. I want to write a function which compare these 2 arrays.
Function should return true only if main array contains sub array element.
Else it should return false.
Here is my logic-
let mainArry = [ ["id":"1","products":["pid": 1, "name": "A", "price": "$5"]], ["id":"3","products":["pid": 3, "name": "B", "price": "$1"]], ["id":"2","products":["pid": 14, "name": "C", "price": "$15"]]]
let array1 = [ ["id":"1","products":["pid": 1, "name": "A", "price": "$5"]], ["id":"3","products":["pid": 3, "name": "B", "price": "$1"]]]
let array2 = [ ["id":"1","products":["pid": 1, "name": "A", "price": "$5"]], ["id":"3","products":["pid": 4, "name": "B", "price": "$1"]]]
func compareDictionary(mainArry:[[String: Any]], arr2: [[String: Any]])-> Bool{
let itemsId = arr2.map { $0["id"]! } // 1, 3, 14
let filterPredicate = NSPredicate(format: "id IN %#", itemsId)
let filteredArray = mainArry.filter{filterPredicate.evaluate(with:$0) }
if filteredArray.count != arr2.count {
return false
}
for obj in filteredArray {
let prd = obj as Dictionary<String, Any>
let str = prd["id"] as! String
let searchPredicate = NSPredicate(format: "id == %#", str )
let filteredArr = arr2.filter{searchPredicate.evaluate(with:$0) }
if filteredArr.isEmpty {
return false
}
if !NSDictionary(dictionary: obj["products"] as! Dictionary<String, Any>).isEqual(to: filteredArr.last!["products"] as! [String : Any]) {
return false
}
}
return true
}
let result1 = compareDictionary(mainArry: mainArry, arr2: array1)
let result2 = compareDictionary(mainArry: mainArry, arr2: array2)
print("Result1 = \(result1)") // true
print("Result2 = \(result2)") //false
It is working. But I want to know the best way to achieve this.
Instead of using for-loop for comparision.
I want to use filter like this
let arrayC = filteredArray.filter{
let dict = $0
return !arr2.contains{ dict == $0 }
}
if arrayC is empty that means both arrays are equal.

Answer 1

I got it Finally!
We don't need to write big function.
let mainArry = [ ["id":"1","products":["pid": 1, "name": "A", "price": "$5"]], ["id":"3","products":["pid": 3, "name": "B", "price": "$1"]], ["id":"2","products":["pid": 14, "name": "C", "price": "$15"]]]
let array1 = [ ["id":"1","products":["pid": 1, "name": "A", "price": "$5"]], ["id":"3","products":["pid": 3, "name": "B", "price": "$1"]]]
let array2 = [ ["id":"1","products":["pid": 1, "name": "A", "price": "$5"]], ["id":"3","products":["pid": 4, "name": "B", "price": "$1"]]]
let result = array2.filter{
let dict = $0
return !mainArry.contains{
return NSDictionary(dictionary: dict).isEqual(to: $0)
}
}
if result.isEmpty {
print("Same key values")
} else {
print("Diff key values")
}