| fun Long.id() = this | |
| fun String.drop2() = if (length >= 2) subSequence(2, length) else null | |
| fun String.anyLength(): Any = length | |
| fun doSimple(s: String?) = 3 == s?.length | |
| fun doLongReceiver(x: Long) = 3L == x?.id() | |
| fun doChain(s: String?) = 1 == s?.drop2()?.length | |
| fun doIf(s: String?) = | |
| if (1 == s?.length) "A" else "B" | |
| fun doCmpWithAny(s: String?) = | |
| 3 == s?.anyLength() | |
| fun doIfNot(s: String?) = | |
| if (!(1 == s?.length)) "A" else "B" | |
| fun doIfNotNot(s: String?) = | |
| if (!!(1 == s?.length)) "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" | |
| } |