3: Functions

Question 1

The contains(element: String) function returns true if the string element is contained in the string it's called on. What will be the output of the following code?

val decorations = listOf ("rock", "pagoda", "plastic plant", "alligator", "flowerpot")
println(decorations.filter {it.contains('p')})

• [pagoda, plastic, plant]

• [pagoda, plastic plant]

• [pagoda, plastic plant, flowerpot]

• [rock, alligator]

Question 2

In the following function definition, which one of the parameters is required?

fun shouldChangeWater(
    day: String, 
    temperature: Int = 22,
    dirty: Int = 20,
    numDecorations: Int = 0
): Boolean {...}

• numDecorations

• dirty

• day

• temperature

Question 3

You can pass a regular named function (not the result of calling it) to another function. How would you pass increaseDirty( start: Int ) = start + 1 to updateDirty(dirty: Int, operation: (Int) -> Int)?

• updateDirty(15, &increaseDirty())

• updateDirty(15, increaseDirty())

• updateDirty(15, ("increaseDirty()"))

• updateDirty(15, ::increaseDirty)