Android Development with Kotlin

Lambda expressions

The simplest way to define anonymous functions in Kotlin is by using a feature called lambda expressions. They are similar to Java 8 lambda expressions, but the biggest difference is that Kotlin lambdas are actually closures, so they allow us to change variables from the creation context. This is not allowed in Java 8 lambdas. We will discuss this difference later in this section. Let's start with some simple examples. Lambda expressions in Kotlin have the following notation:

    { arguments -> function body } 

Instead of return, the result of the last expression is returned. Here are some simple lambda expression examples:

• { 1 }: A lambda expression that takes no arguments and returns 1. Its type is ()->Int.
• { s: String ...