CODEWITHSUNDEEP
iosswift
user9775199
user9775199

Reputation:

Access Value in Dictionary using Random Number

I am trying to access the value from a dictionary using a random number, but I am lost, can someone please guide?

Here is what I have:

var themes = ["Halloween": "😈💀🤡👻🤖👽", "Sports": "🏉🏓⛳️⚽️🎳🎱" , "Faces": "😀😍😨🤗😤🤤", "Animal": "🦓😼😺😿🙀🙈"]

// This Does not work for some reason?
lazy var themeRandomNumber = themes.count.arc4random
lazy var currentTheme = themes[themeRandomNumber]

//Cannot subscript a value of type[String : String]' with an index of type 'Int'

This makes sense since, I am trying to access the key using an Int when it is obviously a String, but not sure how to proceed?

lazy var currentEmoji = themes[currentTheme]

extension Int{
    var arc4random: Int{
        if self > 0 {
            return Int(arc4random_uniform(UInt32(self)))
        } else if self < 0 {
            return -Int(arc4random_uniform(UInt32(abs(self))))
        } else {
            return 0
        }
    }
}

Upvotes: 4

Views: 74

Answers (2)

Dharmesh Kheni
Dharmesh Kheni

Reputation: 71854

Just replace 

lazy var currentEmoji = themes[currentTheme]

with 

var currentTheme = themes.randomElement()
print(currentTheme?.value) //Optional("🏉🏓⛳️⚽️🎳🎱")
print(currentTheme?.key)  //Optional("Sports")

Here randomElement is new property which you can use to get random element.

Upvotes: 4

10623169
10623169

Reputation: 1044

Because you're not accessing the key of your dictionary, you need to select "Halloween", "Sports", "Faces" or "Animal" - your themes dict's keys.

You can use some custom mapping method with Int.random(in: 0...3) or a Keys enum conforming to CaseIterable, and then you need to select a random character (emoji) in the String for your given Key (via a random number in the range 0..<string.length).

EDIT

With Swift 4.2+ (Xcode 10) you can use randomElement():

var themes = ["Halloween": "😈💀🤡👻🤖👽", "Sports": "🏉🏓⛳️⚽️🎳🎱" , "Faces": "😀😍😨🤗😤🤤", "Animal": "🦓😼😺😿🙀🙈"]
var randomEmoji = themes.randomElement()?.value.randomElement()

Upvotes: 2

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