Add object in loop from Dictionary to Array

Question

I would like to add object from dictionary to array.

I'm getting info from JSON, and I would like to add in loop these info with two keys and two values : "name": value1, "imageURL": value2.

I have 10 items in my loop, so I tried this code, but [] is missing :

let urlString = "https://api.unsplash.com/photos/?client_id=71ad401443f49f22556bb6a31c09d62429323491356d2e829b23f8958fd108c4"
let url = URL(string: urlString)!
let urlRequest = URLRequest(url: url)
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)

var arr = [String]()
let task = session.dataTask(with: urlRequest, completionHandler: { (data, response, error) in
    // do stuff with response, data & error here
    if let statusesArray = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [[String: Any]] {
        for item in statusesArray! {
            let photos = item["urls"] as? [String: Any]
            let photo = photos?["small"] as? String
            var myDictionary = [
                "name": "test",
                "imageURL": photo]
            for (key, value) in myDictionary {
                arr.append("\(key): \(value)")
            }
        }
        print(arr)
    }
})

that gives me this :

["imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test", "imageURL: https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name: test"]

Now, I would like to have this (add [] at each object in loop) :

[["imageURL": "https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name": "test"], ["imageURL": "https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name": "test"], ["imageURL": "https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name": "test"], ["imageURL": "https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name": "test"], ["imageURL": "https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name": "test"], ["imageURL": "https://images.unsplash.com/photo-1479859752262-6f02b79ad6ad?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=400&fit=max&s=a613971b6da0b305154e37bbe01ed833", "name": "test"]]

How can I fix this ?

Your question makes no sense. You say you have a dictionary, but it appears you have a dictionary. You say you want the output to be an array. Your code looks like it builds an array of strings, but your output looks more like a single long string. — Duncan C
– Duncan C, Commented Nov 23, 2016 at 19:10
@DuncanC unless i'm misunderstanding, I believe he wants the output to be an array full of dictionaries. Just based on the "I would like to have" text. I could be mistaken though! I often am. — user3353890
– user3353890, Commented Nov 23, 2016 at 19:18

user3353890 · Accepted Answer · 2016-11-23 19:19:38Z

1

Change this part of your code

var myDictionary = [
    "name": "test",
    "imageURL": photo]
for (key, value) in myDictionary {
    arr.append("\(key): \(value)")
}

To this

var myDictionary = [
    "name": "test",
    "imageURL": photo]
arr.append(myDictionary)

You're adding the dictionary to an array so you have an array full of dictionaries. Each dictionary is a full representation of one of your objects.

Edit

declare your array "arr" to hold dictionaries instead of Strings. Just like the error states:

var arr = [[String:String]]()

edited Nov 23, 2016 at 19:19

answered Nov 23, 2016 at 19:09

user3353890

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10 Comments

Duncan C Over a year ago

The OP's "arr" variable is declared as an array of strings. That matches the code he posted. Your code would fail since you can't append a dictionary to an array of String objects.

Vjardel Over a year ago

Cannot convert value of type '[String : String?]' to expected argument type 'String'

user3353890 Over a year ago

Whoops. good catch! That's a pretty easy fix though, just declare the array to hold dictionaries.

user3353890 Over a year ago

just made an edit. it should hopefully work now, but let me know if there are any other issues.

Vjardel Over a year ago

@user3353890 thanks man for your help, but again an error : Value of type '[String : String]' has no member 'append'

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