Swap Function in Kotlin
If you want to write some really scary code, you could have a function like this:
inline operator fun <T> T.invoke(dummy: () -> Unit): T {
dummy()
return this
}
That would allow you to write code like this
a = b { b = a }
Note that I do NOT recommend this. Just showing it's possible.
Edit: Thanks to @hotkey for his comment
I believe the code for swapping two variables is simple enough - not to try simplifying it any further.
The most elegant form of implementation IMHO is:
var a = 1
var b = 2
run { val temp = a; a = b; b = temp }
println(a) // print 2
println(b) // print 1
Benefits:
- The intent is loud and clear. nobody would misunderstand this.
temp
will not remain in the scope.
No need a swap function in Kotlin at all. you can use the existing also function, for example:
var a = 1
var b = 2
a = b.also { b = a }
println(a) // print 2
println(b) // print 1