var anObject = require('../internals/an-object');
var getIteratorMethod = require('../internals/get-iterator-method');

module.exports = function (it, usingIterator) {
  var iteratorMethod = arguments.length < 2 ? getIteratorMethod(it) : usingIterator;
  if (typeof iteratorMethod != 'function') {
    throw TypeError(String(it) + ' is not iterable');
  } return anObject(iteratorMethod.call(it));
};