How can I convert a string to an array of strings in Kotlin? To demonstrate, I have this:
val input_string = "[Hello, World]"
I would like to convert it to ["Hello", "World"].
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How about parsing it as JSON?Ruud Helderman– Ruud Helderman2022-02-08 10:38:02 +00:00Commented Feb 8, 2022 at 10:38
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2 Answers
Assuming that the array elements do not contain commas, you can do:
someString.removeSurrounding("[", "]")
.takeIf(String::isNotEmpty) // this handles the case of "[]"
?.split(", ")
?: emptyList() // in the case of "[]"
This will give you a List<String>. If you want an Array<String>:
someString.removeSurrounding("[", "]")
.takeIf(String::isNotEmpty)
?.split(", ")
?.toTypedArray()
?: emptyArray()
3 Comments
lukas.j
Are you sure you need the step with takeIf (and ?: emptyList())?
Sweeper
@lukas.j Yes. For the input string
[], you want an empty list/array, not a list with one empty string in it, right?lukas.j
Of course, you're right (almost every time I come back to Kotlin I stumble across the split specialities...).
Assuming the strings only consist of letters and/or numbers you could also do it like this
val input_string = "[Hello, World]"
val list = Regex("\\w+").findAll(input_string).toList().map { it.value }
