KT-33761 Add reduceOrNull

2019-12-11 08:31:18 +01:00
parent 39e1b24c2c
commit f5d696d3c4
10 changed files with 345 additions and 0 deletions
@@ -315,6 +315,15 @@ class CollectionTest {
        }
    }

+    @Test fun reduceOrNull() {
+        expect("1234") {
+            val list = listOf("1", "2", "3", "4")
+            list.reduceOrNull { a, b -> a + b }
+        }
+
+        expect(null, { arrayListOf<Int>().reduceOrNull { a, b -> a + b } })
+    }
+
    @Test fun reduceRight() {
        expect("1234") {
            val list = listOf("1", "2", "3", "4")