Dmitry Petrov
495fba43c0
In code like 'a?.b == 42', we can immediately generate equality comparison result when receiver is null (false for '==', true for '!='), since the primitive value is definitely non-null. Otherwise unnecessary boxing/unboxing is generated to handle possibly null result of 'a?.b'.
56 lines
1.3 KiB
Kotlin
Vendored
56 lines
1.3 KiB
Kotlin
Vendored
fun Long.id() = this
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fun String.drop2() = if (length >= 2) subSequence(2, length) else null
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fun String.anyLength(): Any = length
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fun doSimple(s: String?) = 3 == s?.length
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fun doLongReceiver(x: Long) = 3L == x?.id()
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fun doChain(s: String?) = 1 == s?.drop2()?.length
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fun doIf(s: String?) =
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if (1 == s?.length) "A" else "B"
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fun doCmpWithAny(s: String?) =
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3 == s?.anyLength()
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fun doIfNot(s: String?) =
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if (!(1 == s?.length)) "A" else "B"
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fun doIfNotNot(s: String?) =
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if (!!(1 == s?.length)) "A" else "B"
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fun box(): String = when {
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doSimple(null) -> "failed 1"
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doSimple("1") -> "failed 2"
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!doSimple("123") -> "failed 3"
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doLongReceiver(2L) -> "failed 4"
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!doLongReceiver(3L) -> "failed 5"
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doChain(null) -> "failed 6"
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doChain("1") -> "failed 7"
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!doChain("123") -> "failed 7"
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doIf("1") != "A" -> "failed 8"
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doIf("123") != "B" -> "failed 9"
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doIf(null) != "B" -> "failed 10"
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doCmpWithAny(null) -> "failed 11"
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doCmpWithAny("1") -> "failed 12"
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!doCmpWithAny("123") -> "failed 13"
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doIfNot("1") != "B" -> "failed 8"
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doIfNot("123") != "A" -> "failed 9"
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doIfNot(null) != "A" -> "failed 10"
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doIfNotNot("1") != "A" -> "failed 8"
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doIfNotNot("123") != "B" -> "failed 9"
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doIfNotNot(null) != "B" -> "failed 10"
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else -> "OK"
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} |