How to use XOR in Kotlin

find the single number in the array that every element has a duplicate except one.

var a = 0
for (i in numsArray){
    a = a xor i
}
return a

eg. input = [2,2,1] out = 1

It's an extension that can be invoked on any Boolean. You can use it like this:

true.xor(false)

or this:

true xor false

The last one works since the function is defined as infix.

Other similar extensions defined on Boolean are and, or and not:

//very useful example
true.not().or(true).and(false).xor(true)

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