Kotlin Array with named parameter equivalent of swift

Question

Hi i'am new to Kotlin and i would like to do an array with named parameter. In Swift i can do :

let analytics = ["organization_login": "toto", "organization_name": "titi", "lead_email": "tata"]

The type is : [String: String]

I Looked all Array and Arraylist in kotlin but i couln't find the equivalent.

What i want it's to be able to give parameter name for my array.

Edit

I misunderstood the swift syntaxe, it's seem that it's only a dictonary, so we just have to use map.

I'm not too sure about this swift construct, but it really looks like a Map<String, String> — al3c
– al3c, Commented Feb 21, 2020 at 14:11

Renzo Tissoni · Accepted Answer · 2020-02-21 14:21:39Z

3

The reason is that [String: String] is not an array, it's a Dictionary.

The equivalent of Dictionary in Kotlin is Map.

Maps can be created like so:

val map = mapOf("string_one" to "string_2", "string_3" to "string_4")

or, if you want to mutate it:

val mutableMap = mutableMapOf("string_one" to "string_2")

answered Feb 21, 2020 at 14:21

Renzo Tissoni

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1 Comment

gidds Over a year ago

Also worth pointing out: unlike an Array, a Map is unordered. So if you need the mappings to be in a particular order, you should either use a particular implementation (such as LinkedHashMap) that preserves iteration order, or use something else. (Similarly, you can't have multiple mappings for the same key; that's a multi-map.) Finally, you can't access mappings by index; instead, you look up the value for a particular key, e.g. map["string_one"] (or, equivalently, map.get("string_one")) which returns "string_2".

Pavneet_Singh · Accepted Answer · 2020-02-21 14:20:25Z

2

You need to use Map as

val map = mapOf("organization_login" to "toto", "organization_name" to "titi") 
// immutable map

you can also use sortedMapOf, hashMapOf linkedMapOf etc for different algo based storage.

Note: If you want to add more elements later then make sure to use mutableMapOf

edited Feb 21, 2020 at 14:20

answered Feb 21, 2020 at 14:12

Pavneet_Singh

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2 Comments

XCarb Over a year ago

Thanks it's what i wanted

Pavneet_Singh Over a year ago

I am glad that I could help, Happy coding!

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