Similarly to C# extension methods, it’s possible to extend a class without modifying the class code by using the extension functions.
fun Int.isGreaterThan(number : Int) : Boolean {
return this > number
}
//now we have added a new "functionality" to the Int
//class
val a =2
val b = 3
val c a.isGreaterThan(3)
Extension functions are resolved statically not at run time.
miniguide 
Extension method for fragment instantiation:
“`
inline fun instanceOf(vararg params: Pair) : T
= T::class.java.newInstance().apply { arguments = bundleOf(*params) }
“`
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