CODEWITHSUNDEEP
swiftdictionaryrandomkey
Jasper
Jasper

Reputation: 15

Make an array from values belonging to a specific key in a dictionary (Swift 4)

I'm experimenting with dictionaries in Swift 4. I'm trying to make an array from a couple of values belonging to a randomly picked key within a dictionary. I'm not exactly sure how I need to do this in Swift 4. 

//: Dictionary Test 

import UIKit

var database = ["Albert Einstein": ["Alberts first quote",
                                    "Alberts second quote",
                                    "Alberts third quote"],

                     "Martin Luther King": ["Martin's first quote",
                                            "Martin's second quote",
                                            "Martin's third quote"],

                     "Newton": ["Newton's first quote",
                                "Newton's second quote",
                                "Newton's third quote"]]

func randomQuote(){
    //Make an array from database keys
    var authorArray = Array(database.keys)

    //Pick a random author
    let author = (authorArray[Int(arc4random_uniform(UInt32(authorArray.count)))])

    //Make an array from values based on the author we've picked (HERE'S THE PROBLEM)
    let quoteArray = Array(database[author].values)

    //Pick a random quote from the choses author
    let quote = (quoteArray[Int(arc4random_uniform(UInt32(quoteArray.count)))])

    print(author)
    print(quote)
}

randomQuote()

Now obviously let quoteArray = Array(database[author].values) is not working. Anyone an idea how this would work?

Upvotes: 0

Views: 531

Answers (2)

rmaddy
rmaddy

Reputation: 318824

There's lots of little things in randomQuote that need to be fixed.

There's no need for the 2nd use of Array(...).

And database[someKey] already gives you the array of quotes.

You also have some extra sets of parentheses you don't need.

Here's the updated code with all the fixes:

func randomQuote(){
    //Make an array from database keys
    var authorArray = Array(database.keys)

    //Pick a random author
    let author = authorArray[Int(arc4random_uniform(UInt32(authorArray.count)))]

    //Make an array from values based on the author we've picked 
    let quoteArray = database[author]!

    //Pick a random quote from the choses author
    let quote = quoteArray[Int(arc4random_uniform(UInt32(quoteArray.count)))]

    print(author)
    print(quote)
}

Upvotes: 1

GetSwifty
GetSwifty

Reputation: 7746

database[author] is an array, not a dictionary. you need to do:

let quoteArray = database[author]!

Side note: surrounding things in parens when unnecessary is confusing as it make it look like a tuple.

Upvotes: 0

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