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    Kotlin linkedin assessment

Both y and z are immutable references pointing to fixed-size collections of the same four integers. Are there any differences?

val y = arrayOf(10, 20, 30, 40)

val z = listOf(10, 20, 30, 40)

• You can modify the contents of the elements in z but not y.
• You can modify the contents of the elements in y but not z.
• There are not any differences. x and y are a type alias of the same type.
• You add more elements to z since it is a list.

Kotlin linkedin assessment answers

our function is passed a parameter obj of type Any. Which code snippet shows a way to retrieve the original type of obj, including package information?

• obj.typeInfo()
• obj::class.simpleName
• obj.classInfo()
• obj::class

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The following code is occasionally throwing a null pointer exception (NPE). How can you change the code so it never throws an NPE?


println("length of First Name = ${firstName!!.length}”)

• Replace !!. with ?..
• Surround the line with a try/catch block.
• Replace !!. with ?.let.
• Replace !!. with ?:.

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You would like to know each time a class property is updated. Which code snippet shows a built-in delegated property that can accomplish this?

• Delegates.watcher()
• Delegates.observable()
• Delegates.observer()
• Delegates.rx()

linkedin Kotlin assessment

Which line of code shows how to display a nullable string's length and shows 0 instead of null?

• println(b!!.length ?: 0)
• println(b?.length ?? 0)
• println(b == null? 0: b.length)
• println(b?.length ?: 0)

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