Functional Kotlin

Indexed access

The indexed access operator is the array read and write operations with square brackets ([]), that is used on languages with C-like syntax. In Kotlin, we use the get operators for reading and set for writing.

With the Pack.get operator, we can use Pack as an array:

operator fun Pack.get(name: String) = members[name]!!val badWolf = biggerPack["Bad Wolf"]

Most of Kotlin data structures have a definition of the get operator, in this case, the Map<K, V> returns a V?.

The following table will show you different declarations of get with a different number of arguments:

Operator	Equivalent	Notes
x[y]	x.get(y)
x[y1, y2]	x.get(y1, y2)
x[y1, y2..., yN]	x.get(y1, y2..., yN)

 

The set operator has similar syntax:

enum class ...