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Question

Complete the declaration of the getFirstAndLast function which is an extension of the String class with the return type Map <String, Char> that functions to get the first and last characters of the receiver's value.

If run the console will display text like the following:

First char Annabel is K and n for second letter
First char Johnson is D and g for second letter

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fun main() {
val annabel = "Annabel".getFirstAndLast()
val johnson = "Johnson".getFirstAndLast()

val annabelFirstChar = annabel["first"]
val annabelLastChar = annabel["last"]

val johnsonFirstChar = johnson["first"]
val johnsonLastChar = johnson["last"]

println("First char Annabel is $annabelFirstChar and $annabelLastChar for second letter")
println("First char Johnson is $johnsonFirstChar and $johnsonLastChar for second letter")

}

// TODO\
fun String.getFirstAndLast(): Map<String, Char>{
return mapOf()
}

Answer 1

Not sure how "Annabel" has a "K" or "Johnson" has a "D" or "g".
return mapOf("first" to this[0], "last" to this[this.length-1])
would make annabel["first"] == 'A' and annabel['last'] == 'l'.
would make johnson["first"] == 'J' and johnson['last'] == 'n'.