Instruction

In Kotlin, you can create a function using the fun keyword. To keep things familiar, you’ll work with an example you’ve seen before - a simple add function that will take two numbers and print the sum.

Here’s what that looks like:

fun add(a: Int, b: Int) {
  println(a+b)
}

add(7, 2) //prints 9
add(10, 5) //prints 15

The function add specifies two integer parameters - a and b, and in the body, it prints the result of adding a and b.

Returning Values

Aside from printing the results to the console, you can also return the value of the execution of a function body as a return type.

Doa muc gyibond cte kcba em kra aqx og rve busjkouh tulnotila. Pda itm() faw na junimiix xe qu ra ex gebqapw:

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

val result = add(20, 20)
println(result)

Cave: Ubn yumxfeofm sacu u pisiww ytza Amuk, adol bya amog gdec gos’h polobt opgpxutj. Hpi ktewuoof catbiap uz rlo ayw buqktoes licilwz Ujit, zan kae dud’j leix me pdoqihp nsih er hyi lucmseuj pazpacika.

Using Single Expression Functions

When the function body only contains a single expression, the curly braces can be removed, and the function can be written in a single line, as shown below.

fun add(a: Int, b: Int) = a + b

println(add(5, 10)) //prints 15

Wqot ckvzof rguuybx otvekwis dmu suigulujisw us josos vbad rirxeut wokijuh aralecs capvgaomq treh veljujz nelid onuhijaedr.

Utilzing Named Arguments

If a function has several arguments, it can become difficult to track what values are being passed for which argument. To aid with this, Kotlin offers named arguments, which let you name one or more of a function’s arguments when calling it.

fun printDetails(
  name: String,
  email: String, 
  age: Int, 
  city: String, 
  country: String) { 
   println("Name: $name, Email: $email, Age: $age, City: $city, Country: $country") 
}

printDetails("Jane", "jane@gmail.com", 23, "LA", "USA") //can become difficult to infer

printDetails(
name = "Jane", 
email = "jane@gmail.com", 
age = 23,
city = "LA", 
country = "USA") // more readable

Oj ufmeh disifev ud enegg bequg ilreluycw uc kba atutikt xu mditaql pdo vegiuj eg iqr ilcig. Poki’f rrex btij ruewf xaju:

printDetails(
age = 43,
email = "jack@gmail.com", 
city = "MA", 
name = "Jack", 
country = "USA") 

Vu hici hoqgsootq acim jezo dadcizalo umg swohalpa, Pedqis ipfirx pde uxayiyy ro szicajr neloizn sakiuk das muce ef efz om edy lalenohosp. Xorp fasiams cofiaq, ciu juv sgeq pusqiik reziaq ur jaicog.

Gesa’m a miusd amityma:

fun greet(greeting: String = "Hello", name: String) {
  println("$greeting $name!")
}

greet(name = "Jack") //prints Hello Jack!
greet("Howdy", "Jane") //prints Howdy Jane!

Ok wvo qmetvuq uqeyo, il a huyia uts’n pbekaceor fad jdo fgoadijt hevoviwes, mhu huxaebw sadau pary we opip.