It keyword for single parameter in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print each number using the 'it' keyword.

Kotlin

listOf(1, 2, 3).forEach { [1] -> println(it) }

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

Ait

Bnumber

Citem

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Writing an explicit parameter name when 'it' can be used.

Using a different variable name without declaring it.

When a lambda has a single parameter, Kotlin allows you to use the implicit name it without declaring it.

2fill in blank

medium

Complete the code to filter numbers greater than 2 using 'it'.

Kotlin

val filtered = listOf(1, 2, 3, 4).filter { [1] > 2 }

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

Ait

Bnumber

Citem

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name without declaring it.

Forgetting to use 'it' inside the lambda.

The filter lambda has a single parameter, so it can be used to refer to each element.

3fill in blank

hard

Fix the error by replacing the blank with the correct implicit parameter.

Kotlin

val doubled = listOf(1, 2, 3).map { [1] * 2 }

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

Ax

Bit

Cnum

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using an undeclared variable name.

Trying to declare a parameter when 'it' can be used.

In a single-parameter lambda, it is the implicit name for the parameter.

4fill in blank

hard

Fill both blanks to create a map of strings to their lengths using 'it'.

Kotlin

val lengths = listOf("apple", "banana", "cherry").associateWith { [1].[2] }

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

Ait

Blength

Dlengths

Attempts:

3 left

💡 Hint

Common Mistakes

Using an explicit parameter instead of 'it'.

Using a wrong property name for string length.

The associateWith lambda uses it as the implicit parameter, and length is the property to get string length.

5fill in blank

hard

Fill all three blanks to filter and print strings longer than 4 characters using 'it'.

Kotlin

val longWords = listOf("cat", "elephant", "dog", "lion").filter { [1].[2] [3] 4 }
longWords.forEach { println(it) }

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

Ait

Blength

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using explicit parameter names instead of 'it'.

Using wrong comparison operator.

Use it as the implicit parameter, length to get string length, and > to filter strings longer than 4.