Function forEachChildren

docs/external/js/react.development.js:1220–1228

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

(children, forEachFunc, 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,