'Kotlin - Split string into new string

I have a string that is a version number but I only need the last two digits of the string. I.e, 15.0.4571.1502 -> 4571.1502. I can't seem to figure out an efficient way to do this in Kotlin.

Code:

version = "15.0.4571.1502"

var buildOne = version.split(".").toTypedArray()[2]
var buildTwo = version.split(".").toTypedArray()[3]

var new = "$BuildOne"."$BuildTwo"

Error:

The expression cannot be a selector (occur after a dot)
stringkotlin


Solution 1:[1]

You've written the dot outside of the string template, the following should work:

val new = "$BuildOne.$BuildTwo"

You can further simplify your solution, by making use of functions provided in the Kotlin standard library.

val version = "15.0.4571.1502"

val new = version
    .split(".")
    .takeLast(2)
    .joinToString(".")

Solution 2:[2]

val version = "15.0.4571.1502"

val new = version.split('.').drop(2).joinToString(".")
// also possible:
// val new = version.split('.').takeLast(2).joinToString(".")

println(new)

Solution 3:[3]

Another possible solution using List destructuring:

val version = "15.0.4571.1502"
val (_, _, buildOne, buildTwo) = version.split(".")
val new = "$buildOne.$buildTwo"

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Endzeit
Solution 2 lukas.j
Solution 3 Arpit Shukla

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