Function getIteratorFn

lib/assets/react-source/development/react.js:437–449

(maybeIterable)

	var MAYBE_ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
	var FAUX_ITERATOR_SYMBOL = '@@iterator';
	function getIteratorFn(maybeIterable) {
	  if (maybeIterable === null || typeof maybeIterable !== 'object') {
	    return null;
	  }

	  var maybeIterator = MAYBE_ITERATOR_SYMBOL && maybeIterable[MAYBE_ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL];

	  if (typeof maybeIterator === 'function') {
	    return maybeIterator;
	  }

	  return null;
	}

	/**
	 * Keeps track of the current dispatcher.