To group an array by countryName in swift

GroupingArrayUsingDictionaryInSwift-example2.swift

// https://medium.com/@milanpanchal24/how-to-group-array-using-dictionary-in-swift-6d185c8c79c

let employee = [["countryName":"India",     "name":"Milan",     "age":"30"],
                ["countryName":"India",     "name":"Emma",      "age":"25"],
                ["countryName":"NZ",        "name":"Olivia",    "age":"40"],
                ["countryName":"NZ",        "name":"Sophia",    "age":"22"],
                ["countryName":"Canada",    "name":"David",     "age":"33"],
                ["countryName":"Canada",    "name":"Wyatt",     "age":"21"],
                ["countryName":"Portugal",  "name":"Joseph",    "age":"28"]]

let groupedByCountryName = Dictionary(grouping: employee) { $0["countryName"]! }
print(groupedByCountryName)

/*
Output:
["India": [["age": "30", "countryName": "India", "name": "Milan"],
           ["age": "25", "name": "Emma", "countryName": "India"]],
 "NZ": [["countryName": "NZ", "age": "40", "name": "Olivia"],
        ["countryName": "NZ", "name": "Sophia", "age": "22"]],
 "Portugal": [["name": "Joseph", "age": "28", "countryName": "Portugal"]],
 "Canada": [["name": "David", "countryName": "Canada", "age": "33"],
            ["age": "21", "countryName": "Canada", "name": "Wyatt"]]]
*/