sajjadyousefnia

class A { // implicit label @A
    inner class B { // implicit label @B
        fun Int.foo() { // implicit label @foo
            val a = this@A // A's this
            val b = this@B // B's this

            val c = this // foo()'s receiver, an Int
            val c1 = this@foo // foo()'s receiver, an Int

            val funLit = lambda@ fun String.() {

sajjadyousefnia

ints.filter { it > 0 } // this literal is of type '(it: Int) -> Boolean'

sajjadyousefnia

fun main(args: Array<String>) {
    val sajjad = "adult"
    val sina = "child"
    sajjad.thefunction(sina)
}

fun String.thefunction(sina: String) {
    print(this)
}

sajjadyousefnia

stringVariable?.let {
      println("The length of this String is ${it.length}")
}

// Exactly the same as below

stringVariable?.also {
      println("The length of this String is ${it.length}")
}

sajjadyousefnia

stringVariable?.let {
      nonNullString ->
      println("The non null string is $nonNullString")
}

sajjadyousefnia

public inline fun <T, R> T.let(block: (T) -> R): R {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    return block(this)
}

sajjadyousefnia

public inline fun <T> T.also(block: (T) -> Unit): T {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    block(this)
    return this
}

sajjadyousefnia

@SinceKotlin("1.1")
public inline fun <T> T.also(block: (T) -> Unit): T {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    block(this)
    return this
}

sajjadyousefnia

public inline fun <T> T.also(block: (T) -> Unit): T {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    block(this)
    return this
}

sajjadyousefnia

public inline fun <T> T.apply(block: T.() -> Unit): T {
    contract {
        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
    }
    block()
    return this
}