implemented containerType.count(predicate)

2011-12-23 16:48:22 +00:00
parent 3fa49cadc0
commit aa46952531
2 changed files with 16 additions and 1 deletions
@@ -22,6 +22,16 @@ inline fun <T> java.lang.Iterable<T>.all(predicate: (T)-> Boolean) : Boolean {
  return true
 }

+/** Returns the number of items which match the given predicate  */
+inline fun <T> java.lang.Iterable<T>.count(predicate: (T)-> Boolean) : Int {
+  var answer = 0
+  for (elem in this) {
+    if (predicate(elem))
+      answer += 1
+  }
+  return answer
+}
+
 /** Returns the first item in the collection which matches the given predicate or null if none matched */
 inline fun <T> java.lang.Iterable<T>.find(predicate: (T)-> Boolean) : T? {
  for (elem in this) {