Scala code

$*1.$ Submissions MUST compile using SBT with UNCHANGED configuration and

$*$ tests with no compilation errors. Submissions with compilation errors

$*$ will receive $0$ points. Note that refactoring the code will cause the

$*$ tests to fail.

$*$

$*2.$ You MUST NOT edit the SBT configuration and tests. Altering it in your

$*$ submission will result in $0$ points for this assignment.

$*$

$*3.$ You MAY use $($re$)$assignment to variables and "val" and "var"

$*$ declarations $($you will have to$).$

$*$

$*4.$ In all of the exercises in this file, you can only add code between the

$*$ existing $"\{...\}"$ for the val$/$def$.$ That is$,$ you cannot add a new

$*$ val$/$def directly inside the "storage" object.

object storage:

$//$ EXERCISE $6$: Complete the following definition, so that "getAndSetSpy" is

$//$ a $($stateful$)$ function that when invoked it returns a pair.

$//$

$//$ The second component of the pair should behave like "getAndSet" above

$//($with the exception noted next$).$

$//$

$//$ The first component of the pair is a function that, when invoked,

$//$ returns the total number of times that a "set" call has been made.

$//$

$//$ That number should cover all calls to "set" made in all pairs created

$//$ via "getAndSetSpy". That is$,$ the total number is a piece of state

$//$ shared all "set" functions created via "getAndSetSpy".

$//$

$//$ For example:

$//$ val $($spy$1,$ getAndSet$1)=$ getAndSetSpy $()$

$//$ val $($spy$2,$ getAndSet$2)=$ getAndSetSpy $()$

$//$ val $($get$1$a$,$ set$1$a$)=$ getAndSet$1(0)$

$//$ val $($get$2$a$,$ set$2$a$)=$ getAndSet$2(0)$

$//$ set$1$a$(10)$

$//$ set$2$a$(20)$

$//$ spy$1()$

$//$ val res$1$: Int $=2$

$//$

$//$ The result is $2,$ not $1.$

$//$

val getAndSetSpy: $()=>(()=>$ Int, Int $=>(()=>$ Int, Int $=>$ Unit$))=$

$//$ TODO: Complete the definition.

$()=>$ throw UnsupportedOperationException$()$