CODEWITHSUNDEEP
kotlin
sir-haver
sir-haver

Reputation: 3592

How to initiate a fixed size array in data class

I tried to research it but didn't find an answer. I'm creating a data class and in that class I would like to create an array with a fixed size. I tried the following 3 options:

data class User (
    val profilePics = arrayOf("a", "b", "c")
)

data class User (
    val profilePics: Array<String>(3)
)

data class User (
    val profilePics = arrayOfNulls<String>(3)
)

But none of them work. This does work however:

data class User (
    val profilePics: Array<String>
)

How can I initialize a fixed-size strings array inside a data class

Upvotes: 1

Views: 1114

Answers (3)

Dipankar Baghel
Dipankar Baghel

Reputation: 2039

try this - hope this help var array = Array(2){i ->1}

or

var array = arrayOf(1,2,3) // you can increase the size too

Upvotes: 1

Khalid Saeed
Khalid Saeed

Reputation: 146

Use this :

var list:ArrayList <String> = ArrayList(5)

Upvotes: 1

Robby Cornelissen
Robby Cornelissen

Reputation: 97130

You need type annotations on your value parameters.

The following two will compile just fine:

data class User (
    val profilePics: Array<String> = arrayOf("a", "b", "c")
)

data class User (
    val profilePics: Array<String?> = arrayOfNulls<String>(3)
)

Of course, nothing prevents the caller from passing in differently sized arrays when creating instances of any of these data classes:

val user = User(arrayOf("a", "b", "c", "d")) // compiles fine

Upvotes: 1

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