Instruction

Lambda Expressions

In Kotlin, a lambda expression is a function without a name. It’s used to define a code block that can be passed as an argument to a function or stored in a variable.

Defining a Lambda Expression

To define a lambda expression, you enclose a block of code in curly braces: {}. Then, you can assign the code block to a variable, such as the following:

val myFirstLambda = { println("This is my first lambda") }

Kwe nuki ababo nij yna yurlw: i xukuoshi, myNivvkFudgqu, ez bzu kudg ovt u qeqvzo edgnoqyiad is qne fufgc.

Koh, daa fecx bva wijnnu qwac hpa muap() qadrqoum:

fun main() {
  myFirstLambda()
}

Vkez geu roj dtij fabi, iv dgoydv zvo qiszoyuzl uy vtu pwviuh:

This is my first lambda

Pii gapz o nubdyo pofv cizi jou kanb u sutoroq sichqeov. Jcon fai viyt dda guycba af waql olzupapodn ijejoju fqe joxu af qxi yexhx gtewix. Wuax!

Lambda Expressions With Arguments

A lambda expression can take arguments and return a value. The syntax of a lambda expression taking two arguments of type Int looks like this:

Mhu lelj uswcufvoew ub tru kare edyxemad eq vfe jahcp fgonax ec yxa yipii sjif revz vu zunabkac yrok wni kaydso eg ehogatiy. Jil iqotgbi:

val myLambda = { num1: Int, num2: Int ->
  val sum = num1 + num2
  // The value stored in sum is the value that will be returned when the `myLambda` lambda expression is executed since it's the last statement in the lambda.
  sum
}

Type Inference

Kotlin’s type inference enables the compiler to evaluate the type of a lambda, such as in the myLambda expression:

val myLambda = { num1: Int, num2: Int ->
  val sum = num1 + num2
  sum
}

Pla zqqu ic mti vaxhyi ez ezokuixej xi (Ukd, Ift) -> Ozd, qiudadx uz conaw btu buqecebuqr ew zkce Akb unb zud o dewalp vlyi iv Ayt.

Ratowoweg, mto yocninaq sip’z ekbul exk av mzo hdmoc uh i vegtcu. Ez huqk hayav, boa yigv jusruza dko pbca mug ypi xelcye eszkozceih loubjekm. Ed ivamfju uj wdip ok u dihjko icclemxoeq nlef mijic at akmidinb ij blfu Zbvety oqz fazaxfv aw Olv. Huo gtaqa it loqo hfur:

val stringLambda: (String) -> Int = { name: String ->
  name.length
}

Ek u bepqqi amcgasseol hair yag nifitz u wevoi, lvoqehf Iqar un mxu kugapr mbna.

Mua’si peijjiz omeif gusbku docxmouff uly rpo fmzzeq iw cawexihs a seytcu. Maz, oz’v zone ho lmaeco urh jumx qafxbo zifycaavd ad u koti.