find the symmetric difference of two maps in swift

To find the symmetric difference of two maps in Swift, first convert the keys of both maps to sets. Then, use the built-in symmetricDifference method of sets to get the keys that are unique to each map. Finally, create a new dictionary with the unique keys and their associated values.

Here's an example implementation:

main.swift
let map1 = ["a": 1, "b": 2, "c": 3]
let map2 = ["b": 4, "c": 3, "d": 5]

let set1 = Set(map1.keys)
let set2 = Set(map2.keys)

let uniqueKeys = set1.symmetricDifference(set2)

var result: [String: Int] = [:]

for key in uniqueKeys {
    if let value = map1[key] {
        result[key] = value
    } else if let value = map2[key] {
        result[key] = value
    }
}

print(result) // Output: ["a": 1, "b": 4, "d": 5]
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In the above code, set1.symmetricDifference(set2) returns a set containing the unique keys from both maps: ["a", "b", "d"]. The for loop then populates the result dictionary with the values associated with each unique key. The output is ["a": 1, "b": 4, "d": 5].