myblog/node_modules/core-js/modules/core.get-iterator.js

var anObject = require('./$.an-object')
  , get      = require('./core.get-iterator-method');
module.exports = require('./$.core').getIterator = function(it){
  var iterFn = get(it);
  if(typeof iterFn != 'function')throw TypeError(it + ' is not iterable!');
  return anObject(iterFn.call(it));
};