Learn Spring for Android Application Development

Functions

To define a function in Kotlin, you have to use the fun keyword, as follows:

fun firstClass() {    println("First class function")}

The preceding snippet demonstrates that we can declare functions as first class citizens. We can also define functions as class members, as follows:

class A {    fun classMember() {        println("Class member")    }}

A local function is a function that is declared in another one, as follows:

fun outer() {    fun local() {        println("Local")    }        local()}

In the preceding snippet, the local function is declared inside of the outer function. The local functions are only available in the scope of a function where they were declared. This approach can be useful if we want to avoid duplicate code inside of a function.

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