With function behavior and use cases in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use the with function to print the length of the string.

Kotlin

val text = "Hello"
with([1]) {
    println(length)
}

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

Alength

B"Hello"

Ctext

Dprintln

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string literal instead of the variable.

Using a function name instead of the object.

The with function takes an object as its first argument. Here, text is the string object we want to use inside the block.

2fill in blank

medium

Complete the code to use with to build a string and return its length.

Kotlin

val result = with(StringBuilder()) {
    append("Hi")
    append(" there")
    [1]
}

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

Alength

Bbuild()

CtoString()

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Calling toString() without getting length.

Using size which is not a StringBuilder property.

Inside with, this is the StringBuilder. To get the length of the built string, use length.

3fill in blank

hard

Fix the error in the code by completing the with block to correctly modify the list.

Kotlin

val numbers = mutableListOf(1, 2, 3)
with(numbers) {
    add(4)
    [1]
}

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

AaddAll(listOf(5, 6))

Bclear()

Cremove(1)

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove which deletes elements instead of adding.

Using clear which empties the list.

To add multiple elements to the list inside with, use addAll with a list of new elements.

4fill in blank

hard

Fill both blanks to create a with block that modifies a StringBuilder and returns the final string.

Kotlin

val result = with(StringBuilder()) {
    [1]("Hello")
    [2](" World")
    toString()
}

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

Aappend

Binsert

Cdelete

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using insert which adds text at a specific position.

Using delete or replace which modify existing text.

To add text to a StringBuilder, use append. Both blanks need append to build the string.

5fill in blank

hard

Fill all three blanks to use with to configure a MutableList and return its size.

Kotlin

val list = mutableListOf<Int>()
val size = with(list) {
    [1](10)
    [2](20)
    [3]
}

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

Aadd

Csize

Dclear

Attempts:

3 left

💡 Hint

Common Mistakes

Using clear which empties the list.

Trying to use length which is not a list property.

Use add twice to add elements, then size to get the number of elements in the list.