Function getIteratorFn

dash/deps/prop-types@15.8.1.js:230–235

* Returns the iterator method function contained on the iterable object. * * Be sure to invoke the function with the iterable as context: * * var iteratorFn = getIteratorFn(myIterable); * if (iteratorFn) { * var iterator = iteratorFn.call(myIterable); * ...

(maybeIterable)

   * @return {?function}
   */
  function getIteratorFn(maybeIterable) {
    var iteratorFn = maybeIterable && (ITERATOR_SYMBOL && maybeIterable[ITERATOR_SYMBOL] || maybeIterable[FAUX_ITERATOR_SYMBOL]);
    if (typeof iteratorFn === 'function') {
      return iteratorFn;
    }
  }

  /**
   * Collection of methods that allow declaration and validation of props that are