Object declaration syntax in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a singleton object named Logger.

Kotlin

object [1] {
    fun log(message: String) {
        println(message)
    }
}

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

Alogger

BLog

CLogger

DLogObject

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for the object.

Forgetting to use the object keyword.

The keyword object declares a singleton object named Logger.

2fill in blank

medium

Complete the code to call the log function of the Logger object.

Kotlin

fun main() {
    [1].log("Hello, Kotlin!")
}

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

ALogger

BLogObject

Clogger

DLog

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or incorrect object names.

Trying to create an instance instead of using the object directly.

To call the log function, use the object name Logger.

3fill in blank

hard

Fix the error in the object declaration syntax.

Kotlin

object [1] {
    fun greet() = println("Hi!")
}

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

Agreeter

BGreeter

CGreeterObject

DGreeter()

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses after the object name.

Using lowercase names for objects.

Object declarations do not use parentheses. Remove them and use a valid name like Greeter.

4fill in blank

hard

Fill both blanks to declare an object with a property and a function.

Kotlin

object [1] {
    val [2] = "Kotlin"
    fun printName() = println(name)
}

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

AAppConfig

BappName

Cname

DConfig

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between property name and usage in function.

Using lowercase object names.

The object is named AppConfig and the property used in the function is name.

5fill in blank

hard

Fill all three blanks to create an object with a mutable property and a function to update it.

Kotlin

object [1] {
    var [2] = 0
    fun [3](value: Int) {
        count = value
    }
}

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

ACounter

Bcount

CupdateCount

Dcounter

Attempts:

3 left

💡 Hint

Common Mistakes

Using immutable property val instead of var.

Mismatch between property and function parameter names.

The object is Counter, the mutable property is count, and the function to update it is updateCount.