var classof = require('../internals/classof');
var wellKnownSymbol = require('../internals/well-known-symbol');
var Iterators = require('../internals/iterators');

var ITERATOR = wellKnownSymbol('iterator');

module.exports = function (it) {
  var O = Object(it);
  return O[ITERATOR] !== undefined
    || '@@iterator' in O
    // eslint-disable-next-line no-prototype-builtins
    || Iterators.hasOwnProperty(classof(O));
};