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Another approach for sorting nulls.

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This commit is contained in:
Ilya Gorbunov
2015-08-05 21:43:02 +03:00
parent d49a1973e5
commit 5a4e598ba7
4 changed files with 40 additions and 22 deletions
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libraries/stdlib/test/collections/CollectionTest.kt
+13 -7
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@@ -572,13 +572,19 @@ class CollectionTest {
test fun sortedNullableBy() {
fun String.nullIfEmpty() = if (isEmpty()) null else this
listOf(null, "").let {
// expect(listOf(null, "")) { it.sortedBy { it.orEmpty()}}
// expect(listOf("", null)) { it.sortedByDescending { it.orEmpty() }}
// expect(listOf("", null)) { it.sortedByDescending { it?.nullIfEmpty() }}
expect(listOf(null, "")) { it.sortedWith(compareBy<String> { it }.nullsFirst()) }
expect(listOf("", null)) { it.sortedWith(compareByDescending<String> { it }.nullsLast()) }
expect(listOf("", null)) { it.sortedWith(compareByDescending<String> { it.nullIfEmpty() }.nullsLast() ) }
listOf(null, "", "a").let {
expect(listOf(null, "", "a")) { it.sortedWith(nullsFirst(compareBy { it })) }
expect(listOf("a", "", null)) { it.sortedWith(nullsLast(compareByDescending { it })) }
expect(listOf(null, "a", "")) { it.sortedWith(nullsFirst(compareByDescending { it.nullIfEmpty() })) }
}
}
test fun sortedByNullable() {
fun String.nonEmptyLength() = if (isEmpty()) null else length()
listOf("", "sort", "abc").let {
assertEquals(listOf("", "abc", "sort"), it.sortedBy { it.nonEmptyLength() })
assertEquals(listOf("sort", "abc", ""), it.sortedByDescending { it.nonEmptyLength() })
assertEquals(listOf("abc", "sort", ""), it.sortedWith(compareBy(nullsLast(compareBy<Int> {it})) { it.nonEmptyLength()}))
}
}