CODEWITHSUNDEEP
iosarraysswift4.1
Kawazoe Kazuke
Kawazoe Kazuke

Reputation: 175

How to extract specific array in Swift 4

I want to get array value by it's key.

I set the array with below code inside looping .

let que = Question(questionText: "\(questionWord)", options: quizAnsArr, correctAns: correctArrIndex, wrongAns: -1, isAnswered: false)

        quizsArray += [que]

Now I get the below array. Here is my array.

[Kanji_Quiz.Question(questionText: "青", options: ["fast", "color", "heart", "blue"], correctAns: 3, wrongAns: -1, isAnswered: false), Kanji_Quiz.Question(questionText: "暑", options: ["owner", "heart", "hot (temperature)", "end"], correctAns: 2, wrongAns: -1, isAnswered: false)]

I was calling the value by using 

print(quizsArray[questionText])

But it' show error. How can i call the value by index or smth. Please help me.

Upvotes: 1

Views: 96

Answers (2)

PhillipJacobs
PhillipJacobs

Reputation: 2490

@Kawazoe Kazuke

quizsArray is of type [Question]... right ?

So By doing this: print(quizsArray[questionText]), you're asking your program to go into the quizsArray: [Question] and get the value where the index is equal to questionText.

I don't see how that should NOT error.

If you don't want to change quizsArray from a [Question] to a native Swift Dictionary ([String:Any]), Then here's what you need to do:

• loop over the quizsArray. Something like this should do the job:

    for question in quizsArray {
        <code>
    }

• only now will you have access to each question. so:

    for question in quizsArray {
        let text = question.getQuestionText()
        if text.elementsEqual('questionText') {
            let correctAnswerIndex = question.getQuestionAnswerIndex()
            print(question.getQuestionAnswer(correctAnswerIndex))
        }
    }

• Please note that the method getQuestionAnswer(index: Int) and getQuestionAnswerIndex() is just methods i made up. You have to go and code your "getters and setters" where you created the Question class/struct

• So in the end, you should convert all that code to a fucntion where the parameters will be the (key) questionText and the function returns the right answer or even the whole object for that matter. Then you'll be set 👍🏽

Upvotes: 2

Arash Etemad
Arash Etemad

Reputation: 1909

At the first you should find the index of questionText and then print that element:

if let index = quizsArray.index(of: questionText) {
    print(quizsArray[index])
}

But I suggest you to use Dictionary instead of array, you can achieve what you want in Dictionary easily.

Upvotes: 0

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