String methods (substring, split, trim) in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the substring "Hello" from the string.

Kotlin

val text = "Hello, World!"
val sub = text.[1](0, 5)
println(sub)

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

Asubstring

Bsplit

Ctrim

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using split instead of substring will not extract a substring by index.

Using trim removes spaces but does not extract parts of the string.

The substring method extracts a part of the string from index 0 to 5 (exclusive), giving "Hello".

2fill in blank

medium

Complete the code to split the string into words using space as separator.

Kotlin

val sentence = "Kotlin is fun"
val words = sentence.[1](" ")
println(words.joinToString(", "))

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

Atrim

Bsplit

Csubstring

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using substring will not split the string into parts.

Using trim only removes spaces at the ends, not inside the string.

The split method divides the string into parts using the space character, resulting in a list of words.

3fill in blank

hard

Fix the error in the code to remove spaces from the start and end of the string.

Kotlin

val raw = "  Kotlin  "
val clean = raw.[1]()
println("'$clean'")

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

Atrim

Bsplit

Csubstring

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using split will not remove spaces but split the string.

Using substring requires indexes and does not remove spaces automatically.

The trim method removes spaces from the start and end of the string, cleaning it up.

4fill in blank

hard

Fill both blanks to get the last word from the sentence.

Kotlin

val sentence = "Learn Kotlin easily"
val words = sentence.[1](" ")
val lastWord = words[[2]]
println(lastWord)

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

Asplit

Btrim

C2

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using trim instead of split will not create a list of words.

Using index 0 will give the first word, not the last.

First, split divides the sentence into words. Then, index 2 accesses the last word "easily".

5fill in blank

hard

Fill all three blanks to extract "Kotlin" from the string with spaces.

Kotlin

val raw = "  Learn Kotlin  "
val clean = raw.[1]()
val words = clean.[2](" ")
val word = words[[3]]
println(word)

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

Atrim

Bsplit

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Not trimming first leaves spaces in the words.

Using index 0 selects "Learn", not "Kotlin".

First, trim removes spaces around the string. Then, split breaks it into words. Finally, index 1 selects "Kotlin".