CODEWITHSUNDEEP
arraysstringkotlinchar
POMAIIIUK
POMAIIIUK

Reputation: 509

Some problems with converting char array to string

Good day, I'm starter and I have some problem:

I want to convert this "ромка" or this "роМка" to "Ромка" using this code. My code is OK. I have problem with toString().

Rewrite string using only one first upper char. Problem with converting charArray to String

var name = "ромка"
var charName = name.toLowerCase().toCharArray()
charName[0] = charName[0].toUpperCase()

name = charName.toString()

Results:

charName: {'Р', 'о', 'м', 'к', 'а'}

name == "[C@93ec54"

Screenshot

Upvotes: 2

Views: 1011

Answers (3)

Ilya
Ilya

Reputation: 23105

The reason why toString() works this way is that in run time Kotlin arrays are represented with JVM array types, so for example CharArray is char[] in run time. Those JVM types do not provide meaningful implementations of toString, equals, and hashCode methods.

Instead Kotlin provides the extension functions contentToString, contentEquals and contentHashCode for arrays. These functions are implemented so as if the array was a list, for example contentToString would return [Р, о, м, к, а] for the array from the question.

However, if you want to concatenate all chars in a char array to a string, you should use another function: either String(CharArray) available in Kotlin/JVM, or the experimental extension CharArray.concatToString() available for all platforms since Kotlin 1.3.40.

Finally, if your task is to capitalize the first character, then capitalize function will do all these manipulations for you, as @Francesc has suggested in his answer.

Upvotes: 1

Ofekfarjun
Ofekfarjun

Reputation: 236

    var name = "ромка"
    var charName = name.toLowerCase().toCharArray()
    charName[0] = charName[0].toUpperCase()

    name = String(charName)

Upvotes: 3

Francesc
Francesc

Reputation: 29260

var name = "ромка"
val result = name.toLowerCase().capitalize()

Upvotes: 4

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