Kotlin String to Int array

Question

I´m looking for the most efficient way to convert an String like

"[1,2,3,4,5]"

to an array of Int [1,2,3,4,5] in Kotlin

in the JavaScript version JSON.parse<Array<Int>>("[1,2,3,4,5]") — Slai
– Slai, Commented Nov 19, 2017 at 23:41
Hi Julian, the question you suggest as duplicated refers to an array of Strings, and clearly is not the case here. This question is about only one String, containing and array of Int — heisen
– heisen, Commented Nov 19, 2017 at 23:45
For better understanding, here is a question asking for the same case, but in Java stackoverflow.com/questions/7646392/… — heisen
– heisen, Commented Nov 19, 2017 at 23:49
This answer to the above question is pretty easy to translate to idionmatic Kotlin. Or use klaxon or JSONObject, for an answer like @Slai's — Paul Hicks
– Paul Hicks, Commented Nov 19, 2017 at 23:59

heisen · Accepted Answer · 2017-11-20 00:59:39Z

20

Fortunately I've been able to make it work, so I'll leave it here for future reference

val result = "[1,2,3,4,5]".removeSurrounding("[", "]").split(",").map { it.toInt() }

Many thanks to all!

edited Nov 20, 2017 at 0:59

answered Nov 20, 2017 at 0:22

heisen

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1 Comment

Nate T Over a year ago

Competitive programming? Either way, thanks.

Rahul Khatri · Accepted Answer · 2019-09-27 10:35:59Z

3

When user convert list to string and again need that string to list. Due to space between integer app crashes with NumberFormatException for that just remove unnecessary space.

val result = "[1, 2, 3, 4, 5]".removeSurrounding("[","]").replace(" ","").split(",").map { it.toInt() }

answered Sep 27, 2019 at 10:35

Rahul Khatri

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3 Comments

Richard Muvirimi Over a year ago

simply call it.trim().toInt() to remove empty spaces

Nate T Over a year ago

@RichardMuvirimi Can one not specify 2 characters in split? As in List.split(",\ ")

Richard Muvirimi Over a year ago

@NateT use regex kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/split.html

Alex · Accepted Answer · 2017-11-19 23:45:09Z

0

Try with toCharArray() cutting first and last ( '[' and ']' )

inline fun String.toCharArray(
    destination: CharArray, 
    destinationOffset: Int = 0, 
    startIndex: Int = 1, 
    endIndex: Int = length -1
): CharArray (source)

You can then manually copy converted values from char to int in a new array

See more in the kotlin webpage

answered Nov 19, 2017 at 23:45

Alex

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gce · Accepted Answer · 2021-03-12 14:37:24Z

0

Also another way to achieve this:

"[1,2,3,4,5]".replace(Regex("""[\[,\]]"""), "").map { it - '0' }

answered Mar 12, 2021 at 14:37

gce

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