Append array to multi dimensional array

Question

I've created a multidimensinal array which is suppose to hold different sections of news for instance popular and Recent news. i've therefore created a array like this where News is my class.

 var arrayNews = Array<Array<News>>()

After this i'm looping through my first JSON file like this

    for (key: String, subJson: JSON) in jsonArray {
        // Create an object and parse your JSON one by one to append it to your array
        var newNewsObject = News(id: subJson["id"].intValue, title: subJson["title"].stringValue, link: subJson["url"].stringValue, imageLink: subJson["image_url"].stringValue, summary: subJson["news_text"].stringValue, date: subJson["date"].stringValue)


        arrayNews.append(newNewsObject)
    }

However i'm getting following error when i try to append it to the array?

cannot invoke append with an argument list of type (News)

Testing answer

var arrayNews = Array<Array<News>>()
let recentArray = [News]()

    for (key: String, subJson: JSON) in jsonArray {
        // Create an object and parse your JSON one by one to append it to your array
        var newNewsObject = News(id: subJson["id"].intValue, title: subJson["title"].stringValue, link: subJson["url"].stringValue, imageLink: subJson["image_url"].stringValue, summary: subJson["news_text"].stringValue, date: subJson["date"].stringValue)


        recentArray.append(newNewsObject)
    }

    arrayNews.append(recentArray)

error message

immutable value of '[(News)] only has mutating members named append

Eric Aya · Accepted Answer · 2015-04-15 09:41:55Z

5

With

var arrayNews = Array<Array<News>>()

you declare that you will have an array of arrays.

But then you append a new instance of a News object which is not an array.

So you should probably change your arrayNews variable to be an array of News objects:

var arrayNews = [News]()

edited Apr 15, 2015 at 9:41

answered Apr 15, 2015 at 9:29

Eric Aya

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2 Comments

Peter Pik Over a year ago

i've added a test of the answer to my question, i getting a new error

Eric Aya Over a year ago

Because you're using let, it declares a constant that you can't modify. You should use a variable (var) instead.

giorashc · Accepted Answer · 2015-04-15 09:28:12Z

4

arrayNews expects Array elements but you provide it with a News elements.

You can use the following creation of your current section array and then add it to your multi-dimensional array:

let sectionArray = [News]()
sectionArray.append(newNewsObject)
arrayNews.append(sectionArray)

answered Apr 15, 2015 at 9:28

giorashc

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2 Comments

Peter Pik Over a year ago

sectionArray.append(newNewsObject) arrayNews.append(sectionArray) should they both be in the loop?

giorashc Over a year ago

well logically no, the section array should be in the loop and then added to the main array outside this loop

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