---

yaml
---
r: 14246
b: refs/heads/try
c: 3edad35
h: refs/heads/master
v: v3

Author: brson

[refs]

@@ -2,5 +2,5 @@
 refs/heads/master: 61b1875c16de39c166b0f4d54bba19f9c6777d1a
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 4a81779abd786ff22d71434c6d9a5917ea4cdfff
-refs/heads/try: 85175d639f0b40062d2741f4918df48aee3ef758
+refs/heads/try: 3edad3555e1f5c01572f32e84480383c1ae2b472
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105

branches/try/src/libcore/iter.rs

@@ -82,6 +82,16 @@ fn reverse<A:copy,IA:iterable<A>>(self: IA, blk: fn(A)) {
     vec::riter(to_list(self), blk)
 }
 
+fn count<A,IA:iterable<A>>(self: IA, x: A) -> uint {
+    foldl(self, 0u) {|count, value|
+        if value == x {
+            count + 1u
+        } else {
+            count
+        }
+    }
+}
+
 fn repeat(times: uint, blk: fn()) {
     let i = 0u;
     while i < times {
@@ -223,4 +233,9 @@ fn test_max_empty() {
 #[test]
 fn test_reverse() {
     assert to_list(bind reverse([1, 2, 3], _)) == [3, 2, 1];
+}
+
+#[test]
+fn test_count() {
+    assert count([1, 2, 1, 2, 1], 1) == 3u;
 }