added Iterable<T>.reverse() along with foldRight(init, op)

2012-01-07 07:49:54 +00:00
parent 5478ab8540
commit 852e21fe7e
2 changed files with 42 additions and 1 deletions
@@ -140,8 +140,27 @@ class CollectionTest() : TestSupport() {
      val numbers = arrayList<Int>()
      numbers.fold(0){(it, it2) -> it + it2}
    }
+
+    expect("1234") {
+      val numbers = arrayList(1, 2, 3, 4)
+
+      // TODO would be nice to be able to write this as this
+      // numbers.map{it.toString()}.fold(""){it + it2}
+      numbers.map<Int,String>{it.toString()}.fold(""){(it, it2) -> it + it2}
+    }
  }

+  fun testFoldRight() {
+    expect("4321") {
+      val numbers = arrayList(1, 2, 3, 4)
+
+      // TODO would be nice to be able to write this as this
+      // numbers.map{it.toString()}.foldRight(""){it + it2}
+      numbers.map<Int,String>{it.toString()}.foldRight(""){(it, it2) -> it + it2}
+    }
+  }
+
+
  fun testGroupBy() {
    val words = arrayList("a", "ab", "abc", "def", "abcd")
    /*
@@ -179,6 +198,11 @@ class CollectionTest() : TestSupport() {
    assertEquals(arrayList(3, 3), lengths)
  }

+  fun testReverse() {
+    val rev = data.reverse()
+    assertEquals(arrayList("bar", "foo"), rev)
+  }
+
  fun testSort() {
    val coll: List<String> = arrayList("foo", "bar", "abc")