![]() It is using these invokedynamic bytecode instructions that Java is capable of optimizing lambdas at runtime.īut this would be possible on applications running on version below Java 8 like Java 6 for example! Lambdas or higher order functions in java 8 depend upon a very specific bytecode instruction called invokedynamic which was introduced in Java 7. It introduced useful features like lambdas and streams. Java 8 was one of the major releases in Java’s history. Kotlin compiles to java compatible bytecode when running in the JVM mode, thus it depends wholly on the available instruction set that java provides in order for it to have a successful execution. Photo by Ken Treloar on Unsplash Part 1: Why?īefore we answer the “why” part, let’s take a small detour into our old Java world. ![]() We’ll cover part 1 and 2 in this post and leave the rest for the next post, published here. Part 5: What next? Experimental features like inline classes, how it’s possible to have Unit in Kotlin? Part 4: Configuring its behavior using noinline and crossinline Part 3: How it forms the backbone for important language features like type reification? Part 2: How and when should the inline keywords be used and what does it do? Part 1: Why does Kotlin have an inline keyword, why can’t the compiler do it on its own? What role does the underlying Java version play here? So here’s how we’ll dissect the inline keyword: The only way forward is dissecting and understanding each individual functionality that the inline keyword provides and what would happen without it. Also, the fact that it opens up a port for having the capabilities to perform type reification (in a way) is just amazing!īut, if it’s so powerful and such an important component, why is it often ignored by developers alike? What would happen if we don’t use it? Why do we have to specify it explicitly for its magic to work? Can’t it be done as a default at the language level since Kotlin has its own compiler? Not forgetting the fact that it also enables us to write lambdas for applications targeting java versions below Java 8, which do not support the same at the language level without using any external tools. Unlike other language features, this one is a bit under-recognized. Now back to where we were, Kotlin has a reserved keyword called inline.
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