string array literal ? How do I code it simply?

Question

Though that may be a silly question, I can't figure out how to declare an array literal grouping some string literals.

For example, let's assume I want the java array ["January", "February", "March"]. How can I translate this into the latest kotlin version (today, 12.0.0)?

What have I tried?

stringArray("January", "February", "March")

Hadi Hariri · Accepted Answer · 2015-06-01 19:02:21Z

140

You can use arrayOf(), as in

val literals = arrayOf("January", "February", "March")

answered Jun 1, 2015 at 19:02

Hadi Hariri

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3 Comments

Alan Teals Over a year ago

Just a note, really you could do this: 'val literals = arrayOf<String>("January", "February", "March")' but the argument type <String> is already explicit by the content of the array, so it's OK that way and can be omitted.

yooouuri Over a year ago

Or use ["January", "February", "March"]

vman Over a year ago

@yooouuri that is only allowed on annotations and was only just introduced in Kotlin 1.2: kotlinlang.org/docs/reference/…

Macil · Accepted Answer · 2018-05-09 17:53:40Z

7

arrayOf (which translates to a Java Array) is one option. This gives you a mutable, fixed-sized container of the elements supplied:

val arr = arrayOf("January", "February", "March")

that is, there's no way to extend this collection to include more elements but you can mutate its contents.

If, instead of fixed-size, you desire a variable sized collection you can go with arrayListOf or mutableListOf (mutableListOf currently returns an ArrayList but this might at some point change):

val arr = arrayListOf("January", "February", "March")    
arr.add("April")

Of course, there's also a third option, an immutable fixed-sized collection, List. This doesn't support mutation of its contents and can't be extended. To create one, you can use listOf:

val arr = listOf("January", "February", "March")

edited May 9, 2018 at 17:53

Macil

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answered Dec 31, 2017 at 20:51

Dimitris Fasarakis Hilliard

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