RunCatching for safe execution in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to safely execute the block using RunCatching.

Kotlin

val result = runCatching([1] {
    val number = "123".toInt()
    number * 2
})

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A{}

B()

C() ->

D() -> Unit

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect lambda syntax like () -> Unit or {} which are not valid here.

The runCatching function takes a lambda with no parameters, so we use () -> before the lambda block.

2fill in blank

medium

Complete the code to get the result value or null if an exception occurs.

Kotlin

val result = runCatching {
    "abc".toInt()
}.[1]()

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AgetOrNull

BgetOrThrow

CgetOrDefault

DgetOrElse

Attempts:

3 left

💡 Hint

Common Mistakes

Using getOrThrow() which throws the exception instead of returning null.

getOrNull() returns the value if successful or null if an exception was caught.

3fill in blank

hard

Fix the error in the code to handle failure with onFailure.

Kotlin

runCatching {
    val x = 10 / 0
}.[1] {
    println("Error: ${it.message}")
}

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AonSuccess

BonFailure

CgetOrNull

DgetOrElse

Attempts:

3 left

💡 Hint

Common Mistakes

Using onSuccess which runs only if no exception occurred.

onFailure is used to handle exceptions caught by runCatching.

4fill in blank

hard

Fill both blanks to create a map of word lengths only for words longer than 3 characters.

Kotlin

val words = listOf("cat", "house", "dog", "elephant")
val lengths = words.associateWith { [1] }
    .filter { it.value [2] 3 }

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Ait.length

B>

C<

Dit.size

Attempts:

3 left

💡 Hint

Common Mistakes

Using it.size which is invalid for String.

Using < instead of > in filter condition.

Use it.length to get word length and filter with > 3 to keep longer words.

5fill in blank

hard

Fill all three blanks to safely get uppercase words longer than 4 characters.

Kotlin

val words = listOf("apple", "bat", "carrot", "dog")
val safeWords = runCatching {
    words.map { it.[1]() }
}.getOrElse { emptyList() }
.filter { it.length [2] 4 }
.associateWith { it.length [3] 0 }

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Auppercase

B>

C*

Duppercase()

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase without parentheses which is not a function call.

Using < instead of > in filter.

Using + or - instead of * in multiplication.

Use uppercase() to convert words, filter length > 4, and multiply length by 0 to get 0.