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- fragmented logo wp post header copy 825x510 - Learning Kotlin – inline, noinline and crossinline – Fragmented

In this episode of learning kotlin, we look at 3 important keywords – , noinline and . The inline keyword is common and you’ve probably run across this one at some point. What does it mean and when is it useful? We also look at the related but seldom used variants noinline and .

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Show Notes

Snippets:

Simple inlined function:

// Kotlin 
 main(args: Array<String>) {
    functionA()
}

inline  functionA() {
    println("awesomeness !")
}

Warning: Expected performance impact of inlining ‘public inline fun functionA() can be insignificant. Inlining works best for functions with lambda parameters

What the code looks like in Java:

public static final void main(String[] args) {
  String var1 = "awesomeness !";
  System.out.println(var1);
}

Function with lambda parameter:

fun main(args: Array<String>) {
    functionA({
        println("double awesomeness")
    })
}

inline fun functionA(lambda: () -> Unit) {
    println("awesomeness !")
    lambda.invoke()
}

What the code looks like in Java (without inline):

public static final void main(String[] args) {
    functionA(new Function() {
      println("double awesomeness")  
    });
}

public static final void functionA(Function0 lambda) {
    String var1 = "awesomeness !";
    System.out.println(var1);
    lambda.invoke();
}

What the code looks like in Java (with inline):

public static final void main(String[] args) {
    String var1 = "awesomeness !";
    System.out.println(var1);
    String var2 = "double awesomeness";
    System.out.println(var2);
}

Function0:

public interface Function0<out R> : Function<R> {
    /** Invokes the function. */
    public operator fun invoke(): R
}

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