Kotlin Tutorials in Hindi | Invoke operators

Here are some expressions using invoke operator with corresponding functions in Kotlin.

Expression	Translated to
a()	a.invoke()
a(i)	a.invoke(i)
a(i1, i2, ..., in)	a.inkove(i1, i2, ..., in)
a[i] = b	a.set(i, b)

In Kotlin, parenthesis are translated to call invoke member function.

Example

class Example{
 operator fun invoke(x:Int){
 println("You are in invoke function with value of x ="+x)
 }
 }

fun main(args: Array<String>) {
 var e:Example = Example()
 e(10)
 }

Output:

You are in invoke function with value of x = 10