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Add foldIndexed and reduceIndexed groups of functions

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- foldIndexed, foldRightIndexed, reduceIndexed and reduceRightIndexed have been added, in line with filterIndexed etc.;
- Test cases added appropriately for the new functions.
This commit is contained in:
Gabriel Borges
2015-12-13 00:30:21 +03:00
committed by Ilya Gorbunov
parent b3f390abe5
commit d58efff974
8 changed files with 921 additions and 0 deletions
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libraries/stdlib/test/collections/ArraysTest.kt
+32
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@@ -619,6 +619,38 @@ class ArraysTest {
@test fun reduceIndexed() {
expect(-1) { intArrayOf(1, 2, 3).reduceIndexed { index, a, b -> index + a - b } }
expect(-1.toLong()) { longArrayOf(1, 2, 3).reduceIndexed { index, a, b -> index + a - b } }
expect(-1F) { floatArrayOf(1F, 2F, 3F).reduceIndexed { index, a, b -> index + a - b } }
expect(-1.0) { doubleArrayOf(1.0, 2.0, 3.0).reduceIndexed { index, a, b -> index + a - b } }
expect('2') { charArrayOf('1', '3', '2').reduceIndexed { index, a, b -> if (a > b && index == 1) a else b } }
expect(true) { booleanArrayOf(true, true, false).reduceIndexed { index, a, b -> a && b || index == 2 } }
expect(false) { booleanArrayOf(true, true).reduceIndexed { index, a, b -> a && b && index != 1 } }
expect(1.toByte()) { byteArrayOf(3, 2, 1).reduceIndexed { index, a, b -> if (index != 2) (a - b).toByte() else a.toByte() } }
expect(1.toShort()) { shortArrayOf(3, 2, 1).reduceIndexed { index, a, b -> if (index != 2) (a - b).toShort() else a.toShort() } }
assertTrue(assertFails {
intArrayOf().reduceIndexed { index, a, b -> a + b }
} is UnsupportedOperationException)
}
@test fun reduceRightIndexed() {
expect(1) { intArrayOf(1, 2, 3).reduceRightIndexed { index, a, b -> index + a - b } }
expect(1.toLong()) { longArrayOf(1, 2, 3).reduceRightIndexed { index, a, b -> index + a - b } }
expect(1F) { floatArrayOf(1F, 2F, 3F).reduceRightIndexed { index, a, b -> index + a - b } }
expect(1.0) { doubleArrayOf(1.0, 2.0, 3.0).reduceRightIndexed { index, a, b -> index + a - b } }
expect('2') { charArrayOf('1', '3', '2').reduceRightIndexed { index, a, b -> if (a > b && index == 0) a else b } }
expect(true) { booleanArrayOf(true, true, false).reduceRightIndexed { index, a, b -> a && b || index == 1 } }
expect(false) { booleanArrayOf(true, true).reduceRightIndexed { index, a, b -> a && b && index != 0 } }
expect(1.toByte()) { byteArrayOf(3, 2, 1).reduceRightIndexed { index, a, b -> if (index != 1) (a - b).toByte() else a.toByte() } }
expect(1.toShort()) { shortArrayOf(3, 2, 1).reduceRightIndexed { index, a, b -> if (index != 1) (a - b).toShort() else a.toShort() } }
assertTrue(assertFails {
intArrayOf().reduceRightIndexed { index, a, b -> a + b }
} is UnsupportedOperationException)
}
@test fun reduce() {
expect(-4) { intArrayOf(1, 2, 3).reduce { a, b -> a - b } }
expect(-4.toLong()) { longArrayOf(1, 2, 3).reduce { a, b -> a - b } }