Android Development with Kotlin

The implicit name of a single parameter

We can omit lambda parameter definitions and access parameters using the it keyword when two conditions are met:

• There is only one parameter
• Parameter type can be inferred from the context

As an example, let's define the properties a and c again, but this time using the implicit name of a single parameter:

    val a: (Int) -> Int = { it * 2 }         // 1
    val c: (String)->Unit = { println(it) }  // 2 

1. The same as { i -> i * 2 }.
2. The same as { s -> println(s) }.

This notation is really popular in Kotlin, mostly because it is shorter and it allows us to avoid parameter type specification. It also improves the readability of processing defined in LINQ style. This style needs components that have not yet been introduced, ...