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KT-33761 Add reduceOrNull

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Alfredo Delli Bovi
2019-12-11 08:31:18 +01:00
committed by Ilya Gorbunov
parent 39e1b24c2c
commit f5d696d3c4
10 changed files with 345 additions and 0 deletions
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libraries/stdlib/test/collections/ArraysTest.kt
+14
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@@ -1006,6 +1006,20 @@ class ArraysTest {
}
}
@Test fun reduceOrNull() {
expect(-4) { intArrayOf(1, 2, 3).reduceOrNull { a, b -> a - b } }
expect(-4.toLong()) { longArrayOf(1, 2, 3).reduceOrNull { a, b -> a - b } }
expect(-4F) { floatArrayOf(1F, 2F, 3F).reduceOrNull { a, b -> a - b } }
expect(-4.0) { doubleArrayOf(1.0, 2.0, 3.0).reduceOrNull { a, b -> a - b } }
expect('3') { charArrayOf('1', '3', '2').reduceOrNull { a, b -> if (a > b) a else b } }
expect(false) { booleanArrayOf(true, true, false).reduceOrNull { a, b -> a && b } }
expect(true) { booleanArrayOf(true, true).reduceOrNull { a, b -> a && b } }
expect(0.toByte()) { byteArrayOf(3, 2, 1).reduceOrNull { a, b -> (a - b).toByte() } }
expect(0.toShort()) { shortArrayOf(3, 2, 1).reduceOrNull { a, b -> (a - b).toShort() } }
expect(null, { intArrayOf().reduceOrNull { a, b -> a + b } })
}
@Test fun reduceRight() {
expect(2) { intArrayOf(1, 2, 3).reduceRight { a, b -> a - b } }
expect(2.toLong()) { longArrayOf(1, 2, 3).reduceRight { a, b -> a - b } }