In
my previous post, I explained how to set extensions to an existing class. In
this post, I am going to explain how to set extensions to companion object.
Syntax
fun
Type.Companion.functionName(arguments) = definition
C
is capital in ‘Companion’
Ex
fun TestClass.Companion.sum(a: Int, b:
Int): Int {
return a + b
}
Just
like the normal companion functions call, you can call extension functions.
TestClass.sum(10,
20)
Find
the below working application.
HelloWorld.kt
class TestClass { companion object { fun sayHello() { println("Hello") } } } fun main(args: Array<String>) { fun TestClass.Companion.sum(a: Int, b: Int): Int { return a + b } var sumOfNumbers = TestClass.sum(10, 20) println("Sum of 10 and 20 $sumOfNumbers") }
Output
Sum of 10 and 20 30
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