DSL scope control with @DslMarker in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a DSL marker annotation.

Kotlin

import kotlin.annotation.AnnotationRetention.RUNTIME
import kotlin.annotation.AnnotationTarget.CLASS

@DslMarker
annotation class [1]

Drag options to blanks, or click blank then click option'

ADslControl

BDslMarker

CMyDsl

DDslScope

Attempts:

3 left

💡 Hint

Common Mistakes

Using @DslMarker as the annotation name instead of defining a custom annotation.

Forgetting to add @DslMarker before the annotation class.

The DSL marker annotation must be defined with @DslMarker and a custom name like MyDsl.

2fill in blank

medium

Complete the code to apply the DSL marker annotation to a class.

Kotlin

@[1]
class HtmlBuilder {
    fun body(init: BodyBuilder.() -> Unit) {}
}

Drag options to blanks, or click blank then click option'

ADslMarker

BMyDsl

CDslScope

DDslControl

Attempts:

3 left

💡 Hint

Common Mistakes

Using @DslMarker instead of the custom annotation name.

Not annotating the class at all.

You apply your custom DSL marker annotation (MyDsl) to the DSL builder classes to control scope.

3fill in blank

hard

Fix the error in the code by completing the blank to prevent implicit receiver conflicts.

Kotlin

@MyDsl
class BodyBuilder {
    fun div(init: DivBuilder.() -> Unit) {}

    fun text(value: String) {
        println([1])
    }
}

Drag options to blanks, or click blank then click option'

Avalue

Bthis.value

Ctext

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this.value' which may cause confusion with receiver scope.

Using 'init' which is a lambda, not the string value.

Inside the function, use the parameter 'value' directly to print the text content.

4fill in blank

hard

Fill both blanks to define two DSL builder classes with the DSL marker annotation.

Kotlin

@[1]
class DivBuilder {
    fun span(init: SpanBuilder.() -> Unit) {}
}

@[2]
class SpanBuilder {}

Drag options to blanks, or click blank then click option'

AMyDsl

BDslMarker

CDslScope

DDslControl

Attempts:

3 left

💡 Hint

Common Mistakes

Using different annotations for each class.

Using @DslMarker instead of the custom annotation.

Both classes should be annotated with the custom DSL marker annotation to control scope properly.

5fill in blank

hard

Fill all three blanks to create a DSL builder function with proper scope control.

Kotlin

fun html(init: [1].() -> Unit) {
    val builder = [2]()
    builder.[3]()
}

Drag options to blanks, or click blank then click option'

AHtmlBuilder

Cinit

DBodyBuilder

Attempts:

3 left

💡 Hint

Common Mistakes

Using different types for receiver and instance.

Not calling the lambda parameter.

The function takes an HtmlBuilder receiver lambda, creates an HtmlBuilder instance, and calls init on it.