Swift for-loop "Expression type '[[String : String]]' is ambiguous without more context

Question

I am trying to access the following items from an Array of dictionaries and I have two problems (both are different approaches). The array of dictionaries is initialized as follows:

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

testingArray.append(["name": "Ethiopia", "url": "localhost:8088"])
testingArray.append(["name": "Bugatti", "url": "localhost:8088"])
testingArray.append(["name": "Brazil", "url": "localhost:8088"])
testingArray.append(["name": "Jasmine", "url": "localhost:8088"])
testingArray.append(["name": "Hello", "url": "localhost:8088"])

The first method:

for (k,v) in testingArray {
    // code here
}

Won't run due to (which appears on the line the for loop is initialized):

"Expression type '[[String : String]]' is ambiguous without more context

The second method:

for indices in testingArray {
    for(k, v) in indices {
        print(indices.keys)
    }
}

returns the following:

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Ethiopia"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Ethiopia"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Bugatti"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Bugatti"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Brazil"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Brazil"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Jasmine"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Jasmine"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Hello"], _transform: (Function))

LazyMapCollection<Dictionary<String, String>, String>(_base: ["url": "localhost:8088", "name": "Hello"], _transform: (Function))

Here is pseudocode equivalent that I am trying to achieve:

for(int i = 0; i < sizeOfArray; i++ {
    print testingArray[i]."name"
    print testingArray[i]."url"
}

I have been scratching my head over this for days but I don't know swift and its idioms well enough to solve this alone, any help would greatly be appreciated (esp if we can figure out how to get #1 working).

Answer 1

I agree the error message is confusing/misleading. But for (k,v) in testingArray doesn't make sense, because testingArray is an array, not a dictionary. Its elements are dictionaries.

I think you're looking for something like this:

for obj in testingArray {
    print(obj["name"])
    print(obj["url"])
}