Cleanup ReactChildren

Author: zpao

src/utils/ReactChildren.js

@@ -129,19 +129,19 @@ function mapChildren(children, func, context) {
  return mapResult;
 }
 
-/**
-* Count the number of children that are typically specified as
-* `props.children`.
-*/
-
 function forEachSingleChildDummy(traverseContext, child, name, i) {
  return null;
 }
 
-function countChildren(children, context) {
- var numberOfChildren = traverseAllChildren(children, forEachSingleChildDummy,
- null);
- return numberOfChildren;
+/**
+ * Count the number of children that are typically specified as
+ * `props.children`.
+ *
+ * @param {?*} children Children tree container.
+ * @return {number} The number of children.
+ */
+function countChildren(children, context) {
+ return traverseAllChildren(children, forEachSingleChildDummy, null);
 }
 
 var ReactChildren = {

src/utils/traverseAllChildren.js

@@ -183,12 +183,11 @@ var traverseAllChildrenImpl =
  * @return {!number} The number of children in this subtree.
  */
 function traverseAllChildren(children, callback, traverseContext) {
- if (children !== null && children !== undefined) {
- return traverseAllChildrenImpl(children, '', 0, callback, traverseContext);
- }
- else {
+ if (children == null) {
  return 0;
  }
+
+ return traverseAllChildrenImpl(children, '', 0, callback, traverseContext);
 }
 
 module.exports = traverseAllChildren;