Question

How to remove duplicate elements from a dictionary in Swift

Answer 1

import Foundation

var dict: [String: Int?] = ["swift": 3, "c": 4, "c++": 3, "python": 3, "java": 5, "rust": 3]

var resultDict = [String: Int]()

for (key, value) in dict {
    if let val = value, !resultDict.values.contains(val) {
        resultDict[key] = val
    }
}

print("Original Dictionary:", dict)
print("New Dictionary:", resultDict)




/*
run:

Original Dictionary: ["c++": Optional(3), "c": Optional(4), "python": Optional(3), "rust": Optional(3), "java": Optional(5), "swift": Optional(3)]
New Dictionary: ["java": 5, "c++": 3, "c": 4]

*/

 

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Answer 2

import Foundation

var dict = ["swift": 3, "c": 4, "c++": 3, "python": 3, "java": 5, "rust": 3]

var resultDict = [String:Int]()

for(key, value) in dict {
   if !resultDict.values.contains(value) {
      resultDict[key] = value
   }
}

print("Original Dictionary:", dict)
print("New Dictionary:", resultDict)




/*
run:

Original Dictionary: ["swift": 3, "python": 3, "java": 5, "rust": 3, "c++": 3, "c": 4]
New Dictionary: ["c": 4, "java": 5, "swift": 3]

*/

 

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