How to append an array in another array in Swift?

Question

I have a JSON response whose answer I have to parse. I write the single elements into an array called courseDataArray using a for loop. After that, I want to write this newly created array into another array called combinedCourseArray with the aim to pass that on to a UITableView. Creating the first array seems to work fine.

But how can I create another array combinedCourseArray who contain all arrays of type courseDataArray?

for (index, element) in result.enumerate() {

            // get one entry from the result array
            if let courseEntry = result[index] as? [String:AnyObject]{

                //work with the content of the array
                let courseName = courseEntry["name"]
                let courseType = courseEntry["course_type"]
                let courseDate = courseEntry["cor_date"]
                let courseId = courseEntry["cor_id"]
                let duration = courseEntry["duration"]
                let schoolId = courseEntry["sco_id"]
                let status = courseEntry["status"]


                let courseDataArray = ["courseName" : courseName, "courseType": courseType, "courseDate": courseDate, "courseId": courseId, "duration": duration, "schoolId":schoolId, "status":status]

                print(courseDataArray)

                var combinedCourseArray: [String: AnyObject] = [:]
                combinedCourseArray[0] = courseDataArray //does not work -- error: cannot subscript a value of type...

               // self.shareData.courseStore.append(scooter)

            }

combinedArray should be of type [[String: AnyObject]] as it is an Array<[String:AnyObject]>. Use var combinedCourseArray: [[String: AnyObject]] = [[:]] — Khundragpan
– Khundragpan, Commented Jul 27, 2016 at 16:03
Thx. that was the problem. I had to add ? after AnyObject: var combinedCourseArray: [[String: AnyObject?]] = [[:]] — Stefan Badertscher
– Stefan Badertscher, Commented Jul 27, 2016 at 16:27
BTW, courseDataArray is actually a Dictionary not an Array — David Berry
– David Berry, Commented Jul 27, 2016 at 17:32

Wyetro · Accepted Answer · 2016-07-27 16:05:31Z

5

You should move the combinedCourseArray declaration outside of the array. It should be var combinedCourseArray: [[String: AnyObject]] = [[:]] since it's an array and not a dictionary.

And you should be doing

combinedCourseArray.append(courseDataArray)

instead of

combinedCourseArray[0] = courseDataArray

answered Jul 27, 2016 at 16:05

Wyetro

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1 Comment

Stefan Badertscher Over a year ago

Thx. works fine. I had to add the question mark here: var combinedCourseArray: [[String: AnyObject?]] = [[:]]

Shakeel Ahmed · Accepted Answer · 2017-02-28 05:57:23Z

5

var FirstArray = [String]()
var SecondArray = [String:AnyObject]()

FirstArray.append(contentsOf: SecondArray.value(forKey: "key") as! [String])

edited Feb 28, 2017 at 5:57

answered Feb 28, 2017 at 5:30

Shakeel Ahmed

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Comments

Nirav D · Accepted Answer · 2016-07-27 16:06:40Z

3

First declare this combinedCourseArray array out side this loop

var combinedCourseArray: [[String: AnyObject]] = [[String: AnyObject]]()
for (index, element) in result.enumerate() {

        // get one entry from the result array
        if let courseEntry = result[index] as? [String:AnyObject]{

            //work with the content of the array
            let courseName = courseEntry["name"]
            let courseType = courseEntry["course_type"]
            let courseDate = courseEntry["cor_date"]
            let courseId = courseEntry["cor_id"]
            let duration = courseEntry["duration"]
            let schoolId = courseEntry["sco_id"]
            let status = courseEntry["status"]


            let courseDataArray = ["courseName" : courseName, "courseType": courseType, "courseDate": courseDate, "courseId": courseId, "duration": duration, "schoolId":schoolId, "status":status]

            print(courseDataArray)


            combinedCourseArray.append(courseDataArray) //does not work -- error: cannot subscript a value of type...

           // self.shareData.courseStore.append(scooter)

        }
 }

answered Jul 27, 2016 at 16:06

Nirav D

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1 Comment

Stefan Badertscher Over a year ago

Thx. works fine. I had to add the question mark here: var combinedCourseArray: [[String: AnyObject?]] = [[:]]

David Berry · Accepted Answer · 2016-07-27 17:30:04Z

Just use flatMap on the outer array to translate one array into another array, possibly dropping some elements:

let courseDataArray : [[String:AnyObject?]] = result.flatMap {
    guard let courseEntry = $0 as? [String:AnyObject] else {
        return nil
    }

    return [
        "courseName" : courseEntry["name"],
        "courseType": courseEntry["course_type"],
        "courseDate": courseEntry["cor_date"],
        "courseId": courseEntry["cor_id"],
        "duration": courseEntry["duration"],
        "schoolId": courseEntry["sco_id"],
        "status": courseEntry["status"]
    ]
}

Of course, the guard isn't really necessary since the input type is presumably already [[String:AnyObject]] and since you then can't have any internal failures, you can just use map instead of flatMap

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