| fun Long.id() = this |
| |
| fun String.drop2() = if (length >= 2) subSequence(2, length) else null |
| |
| fun String.anyLength(): Any = length |
| |
| |
| fun doSimple(s: String?) = s?.length == 3 |
| |
| fun doLongReceiver(x: Long) = x?.id() == 3L |
| |
| fun doChain(s: String?) = s?.drop2()?.length == 1 |
| |
| fun doIf(s: String?) = |
| if (s?.length == 1) "A" else "B" |
| |
| fun doCmpWithAny(s: String?) = |
| s?.anyLength() == 3 |
| |
| fun doIfNot(s: String?) = |
| if (!(s?.length == 1)) "A" else "B" |
| |
| fun doIfNotNot(s: String?) = |
| if (!!(s?.length == 1)) "A" else "B" |
| |
| fun box(): String = when { |
| doSimple(null) -> "failed 1" |
| doSimple("1") -> "failed 2" |
| !doSimple("123") -> "failed 3" |
| |
| doLongReceiver(2L) -> "failed 4" |
| !doLongReceiver(3L) -> "failed 5" |
| |
| doChain(null) -> "failed 6" |
| doChain("1") -> "failed 7" |
| !doChain("123") -> "failed 7" |
| |
| doIf("1") != "A" -> "failed 8" |
| doIf("123") != "B" -> "failed 9" |
| doIf(null) != "B" -> "failed 10" |
| |
| doCmpWithAny(null) -> "failed 11" |
| doCmpWithAny("1") -> "failed 12" |
| !doCmpWithAny("123") -> "failed 13" |
| |
| doIfNot("1") != "B" -> "failed 8" |
| doIfNot("123") != "A" -> "failed 9" |
| doIfNot(null) != "A" -> "failed 10" |
| |
| doIfNotNot("1") != "A" -> "failed 8" |
| doIfNotNot("123") != "B" -> "failed 9" |
| doIfNotNot(null) != "B" -> "failed 10" |
| |
| else -> "OK" |
| } |