Appending dictionary items in to Array<Dictionary<String, String>>

Question

Let me create these 3 dictionaries:

var animal1 = ["name":"lion", "footCount":"4", "move":"run"]
var animal2 = ["name":"Fish", "footCount":"0", "move":"swim"]
var animal3 = ["name":"bird", "footCount":"2", "move":"fly"]

And then let me create this array:

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

and then let me append above dictionaries in to myArray

myArray.append(animal1)
myArray.append(animal2)
myArray.append(animal3)

I see 4 items if I run below code

print(myArray.count)

because the array is created with one empty item: var myArray= [[String : String]()] So I need to use below code all the time:

myArray.removeFirst()

My question is: Is there another alternative array defination to append above dictionaries? Because I must execute above code all the time if I use this array defination:

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

Sweeper · Accepted Answer · 2019-11-22 07:43:39Z

1

You can create an empty array of dictionaries like this:

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

Note that the ()s are outside of the outer []s. Your attempt of [String : String]()] is an array literal containing one element of an empty dictionary, whereas you should be calling the initialiser for the array type of [[String : String]] (aka Array<Dictionary<String, String>>).

Since you have all the elements you want in the array already, you could just do:

var myArray = [animal1, animal2, animal3]

as well.

Seeing how all your dictionary keys are the same though, you should really create a custom struct for this:

struct Animal {
    let name: String
    let footCount: Int
    let move: String
}

And your array can be:

var myArray= [Animal]()

answered Nov 22, 2019 at 7:43

Sweeper

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