6 magic sugars that can make your Kotlin codebase happier #10

Sugar.kt

fun access(contract: Contract,
           employee: Employee) = when (Pair(contract, employee)) {
    Pair(PROBATION, SENIOR_ENGINEER),
    Pair(PROBATION, REGULAR_ENGINEER),
    Pair(PROBATION, JUNIOR_ENGINEER) -> NotGranted(AssertionError("Access not allowed on probation contract."))
    Pair(PERMANENT, SENIOR_ENGINEER),
    Pair(PERMANENT, REGULAR_ENGINEER),
    Pair(PERMANENT, JUNIOR_ENGINEER),
    Pair(CONTRACTOR, SENIOR_ENGINEER) -> Granted(DateTime(1))
    Pair(CONTRACTOR, REGULAR_ENGINEER),
    Pair(CONTRACTOR, JUNIOR_ENGINEER) -> Blocked("Access for junior contractors is blocked.")
    else -> throw AssertionError("Unsupported case of $employee and $contract")
}