added count(predicate) helper function to String along with Char.is*() methods from java.lang.Character

libraries/stdlib/src/kotlin/Char.kt

@@ -0,0 +1,27 @@
+package kotlin
+
+public inline fun Char.isDefined(): Boolean = Character.isDefined(this)
+
+public inline fun Char.isDigit(): Boolean = Character.isDigit(this)
+
+public inline fun Char.isHighSurrogate(): Boolean = Character.isHighSurrogate(this)
+
+public inline fun Char.isIdentifierIgnorable(): Boolean = Character.isIdentifierIgnorable(this)
+
+public inline fun Char.isISOControl(): Boolean = Character.isISOControl(this)
+
+public inline fun Char.isJavaIdentifierPart(): Boolean = Character.isJavaIdentifierPart(this)
+
+public inline fun Char.isJavaIdentifierStart(): Boolean = Character.isJavaIdentifierStart(this)
+
+public inline fun Char.isJavaLetter(): Boolean = Character.isJavaLetter(this)
+
+public inline fun Char.isJavaLetterOrDigit(): Boolean = Character.isJavaLetterOrDigit(this)
+
+/**
+ * Returns true if the character is whitespace
+ *
+ * @includeFunctionBody ../../test/StringTest.kt count
+ */
+public inline fun Char.isWhitespace(): Boolean = Character.isWhitespace(this)
+

libraries/stdlib/src/kotlin/Strings.kt

@@ -211,4 +211,19 @@ public inline fun CharSequence.subSequence(start : Int, end : Int) : CharSequenc
 
 public inline fun CharSequence.get(start : Int, end : Int) : CharSequence? = subSequence(start, end)
 
-public inline fun CharSequence.toString() : String? = (this as java.lang.CharSequence).toString()
+public inline fun CharSequence.toString() : String? = (this as java.lang.CharSequence).toString()
+
+/**
+ * Counts the number of characters which match the given predicate
+ *
+ * @includeFunctionBody ../../test/StringTest.kt count
+ */
+public inline fun String.count(predicate: (Char) -> Boolean): Int {
+    var answer = 0
+    for (c in this) {
+        if (predicate(c)) {
+            answer++
+        }
+    }
+    return answer
+}