Function Tricks

• In same program or class we can’t Define two function with same name

• It will cause compilation error because compiler can not set two different set of statement to the same name.

• To solve this error we can change one of the function name

• OR we can use ⤵️ this.

Function Overloading Methods:

1. Same Name different parameters:
• Either number of parameter is different
• OR parameters types are different
 

⇒ number of parameter is different :

⇒ parameters types are different:

fun main() {

		printLn(addition( 1, 2))
		printLn(addition( 1.0, 2.0))

}

fun addition(a: Int, b: Int) : Int
{
	return a + b
}

fun addition(a:Double, b:Double) :Double
{
	return a + b
}

⇒ Named Argumets:

• when our calling function passing two or more argument but we want set which parameter get this argument perticularly

• Then we can set named argument

• we Can give argument in any order

• Its value will only be assigned to that parameter that we have named / Defined.

fun main(){

		println(addition(a = 20 , b = 30))   // 50
		println(addition(b = 30 , a = 70))   // 70
}

fun addition(a: Int, b: Int) : Int
{
	return a + b
}

⇒ Store function in addition addition Variable:

• In Kotlin we can store whole function prototype in variable

• with the help of Scope resolution Operator ::

• its same as giving refence of function to the variable or giving alias name of the function

fun main(){

		var fn  =  ::addition
		println(fn(3.0 , 7.0))      // 10.0
		println(fu(25.0 , 25.0))    // 50.0

}

fun addition(a:Double, b:Double) :Double
{
	return a + b
}