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View File Name : _collectNonEnumProps.js

define(['./_setup', './isFunction', './_has'], function (_setup, isFunction, _has) {

  // Internal helper to create a simple lookup structure.
  // `collectNonEnumProps` used to depend on `_.contains`, but this led to
  // circular imports. `emulatedSet` is a one-off solution that only works for
  // arrays of strings.
  function emulatedSet(keys) {
    var hash = {};
    for (var l = keys.length, i = 0; i < l; ++i) hash[keys[i]] = true;
    return {
      contains: function(key) { return hash[key] === true; },
      push: function(key) {
        hash[key] = true;
        return keys.push(key);
      }
    };
  }

  // Internal helper. Checks `keys` for the presence of keys in IE < 9 that won't
  // be iterated by `for key in ...` and thus missed. Extends `keys` in place if
  // needed.
  function collectNonEnumProps(obj, keys) {
    keys = emulatedSet(keys);
    var nonEnumIdx = _setup.nonEnumerableProps.length;
    var constructor = obj.constructor;
    var proto = (isFunction(constructor) && constructor.prototype) || _setup.ObjProto;

    // Constructor is a special case.
    var prop = 'constructor';
    if (_has(obj, prop) && !keys.contains(prop)) keys.push(prop);

    while (nonEnumIdx--) {
      prop = _setup.nonEnumerableProps[nonEnumIdx];
      if (prop in obj && obj[prop] !== proto[prop] && !keys.contains(prop)) {
        keys.push(prop);
      }
    }
  }

  return collectNonEnumProps;

});