IntelliJ IDEA 2021.3 Help

Kotlin

Parameter hints

Controls whether hints should appear for function and constructor arguments.

data class User(val id: Int) fun printSum(a: Int, b: Int) = println(a + b) fun hintsDemo() { val u = User(0) // calling constructor printSum(1, 1) // calling function }

Use Exclude list to disable parameter inlay hints for specific methods.

Types

Property types

Controls whether hints should appear when assigning a value to a property whose type is not explicitly specified.

class User(_id: Int = 0) { val id = _id // inferred property type }

Local variable types

Controls whether hints should show the type when a local variable, whose type is not specified, is assigned some value. The type is not shown for constants.

fun returnHello(): String = "Hello" fun hintsDemo() { val s = returnHello() // "s" gets the String type }

Function return types

Controls whether hints should appear for functions with inferred return types.

fun sum(i1: Int, i2: Int) = i1 + i2 // the return type (Int) is inferred

Function parameter types

Controls whether hints should appear for lambda parameters without a type.

fun hintsDemo() { listOf(1, 2, 3).filter { elem -> // parameter with inferred type elem >= 3 } }

Lambdas

Return expressions

Controls whether hints should appear for multiline lambdas that return a value. This is useful in complex constructs, where it is easy to forget that a lambda is returning something.

fun numbers(): String { val numbers = StringBuilder() return with(numbers) { // "with" structure starts here for (letter in '0'..'9') { append(letter) } toString() // used as the return value } }

Implicit receivers and parameters

Controls whether hints should appear for lambdas' implicit receivers.

fun numbers(): String { val numbers = StringBuilder() return with(numbers) { // the implicit receiver is "numbers" (StringBuilder) for (letter in '0'..'9') { append(letter) } toString() } }

URL path inlay

Controls whether an inlay hint should appear at URL mappings allowing you to quickly access the related actions.

Url inlay
Last modified: 08 March 2021