Function forEachChildren

code/new-context-api/public/app.js:18548–18555

* Iterates through children that are typically specified as `props.children`. * * See https://reactjs.org/docs/react-api.html#react.children.foreach * * The provided forEachFunc(child, index) will be called for each * leaf child. * * @param {?*} children Children tree container. * @param {fu

(children, forEachFunc, forEachContext)

 * @param {*} forEachContext Context for forEachContext.
 */
function forEachChildren(children, forEachFunc, forEachContext) {
  if (children == null) {
    return children;
  }
  var traverseContext = getPooledTraverseContext(null, null, forEachFunc, forEachContext);
  traverseAllChildren(children, forEachSingleChild, traverseContext);
  releaseTraverseContext(traverseContext);
}

function mapSingleChildIntoContext(bookKeeping, child, childKey) {
  var result = bookKeeping.result,