Dictionary fetch all keys and use them as Array [duplicate]

Question

I use method .keys from the Dictionary to fetch all keys that are in the dictionary and work with them like Array.

Problem when i fetch it .keys it returns LazyMapCollection how i can convert it to Array of keys.

Precondition:

User is structure with funds not nil dictionary [String:String].

let keys = user.funds?.keys

How should i convert keys to be Array?

iWheelBuy · Accepted Answer · 2017-05-01 11:42:24Z

9

Maybe using map will help:

let dictionary: [String:String] = [:]
let keys: [String] = dictionary.map({ $0.key })

Don't like map? Go this way:

let dictionary: [String:String] = [:]
let keys: Array<String> = Array<String>(dictionary.keys)

edited May 1, 2017 at 11:42

answered May 1, 2017 at 11:40

iWheelBuy

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4 Comments

Oleg Gordiichuk Over a year ago

I know this but how i can do this with help of .keys

iWheelBuy Over a year ago

@OlegGordiichuk updated the answer

Oleg Gordiichuk Over a year ago

Thx for the response

Lance Samaria Over a year ago

Great answer. I wanted something other then a for loop and I used the 2nd way (no map). I like it better then all the answers in the link to “this question already has an answer here”

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