How to set dictionary values to nil

remove-from-dictionary.swift

//
//  main.swift
//  RemoveFromDictionary
//
//  Created by Maris Lagzdins on 16/02/2023.
//

import Foundation

var oscarWinners = [
    "Best Actor": "Will Smith",
    "Best Actress": "Jessica Chastain",
    "Best Picture": "CODA",
    "Best Director": nil
]

print(oscarWinners)
/*
 [
    "Best Actress": Optional("Jessica Chastain"),
    "Best Picture": Optional("CODA"),
    "Best Actor": Optional("Will Smith"),
    "Best Director": nil
 ]
 */

// Setting the value as `nil` will remove the value with it's key from the dictionary.
oscarWinners["Best Picture"] = nil

print(oscarWinners)
/*
 [
     "Best Actress": Optional("Jessica Chastain"),
     "Best Actor": Optional("Will Smith"),
     "Best Director": nil
 ]
 */

// Updating the value as `nil` will only change the value but will not remove the key from the dictionary.
oscarWinners.updateValue(nil, forKey: "Best Actor")

print(oscarWinners)
/*
 [
     "Best Actress": Optional("Jessica Chastain"),
     "Best Actor": nil,
     "Best Director": nil
 ]
 */