text: var aCallable = require('../internals/a-callable');
  var anObject = require('../internals/an-object');
  var getIteratorMethod = require('../internals/get-iterator-method');
  
  module.exports = function (argument, usingIterator) {
    var iteratorMethod = arguments.length < 2 ? getIteratorMethod(argument) : usingIterator;
    if (aCallable(iteratorMethod)) return anObject(iteratorMethod.call(argument));
    throw TypeError(String(argument) + ' is not iterable');
  };
  