CODEWITHSUNDEEP
swift
Glutch
Glutch

Reputation: 720

Initiate empty Swift array of dictionaries

I currently have this:

var locations = [
    ["location": "New York", "temp": "2 °C", "wind": "3 m/s"]
]

And I add stuff to this with locations.append(). It works great!

However, I don't want there to be a default entry. So I tried

var locations = [] // Not working.
var locations = [] as NSArray
var locations = [] as NSMutableArray
var locations = [] as NSDictionary
var locations = [] as NSMutableDictionary
var locations = [:] as ... everything
var locations = [APIData]

Feels like I've tried everything but I still get countless errors whatever I try. At this stage I'm even surprised my default locations is working.

How do I solve this? How do I make locations empty to start with?

Upvotes: 0

Views: 733

Answers (2)

anakin
anakin

Reputation: 589

If we assume you try to initialize a array of dictionary with key String and value String you should:

var locations: [[String: String]] = []

then you could do:

locations.append(["location": "New York", "temp": "2 °C", "wind": "3 m/s"])

Upvotes: 4

sundance
sundance

Reputation: 3020

To create an array or dictionary you should know the type you need.

With

var array: [String]

you declare a variable to contain an array of strings. To initialize it, you can use

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

You can omit the : [String] because the compiler can automatically detect the type in this case.

To create a dictionary you can do the same, but you need to define both, the key and the value type:

var dictionary = [String: String]()

Now, what you ask for is an array of dictionaries, so you need to combine both to

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

Upvotes: 0

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