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- # _collectNonEnumProps.js

- ¶

      import { nonEnumerableProps, ObjProto } from './_setup.js';
      import isFunction from './isFunction.js';
      import has from './_has.js';

- ¶

  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.

      export default function collectNonEnumProps(obj, keys) {
        keys = emulatedSet(keys);
        var nonEnumIdx = nonEnumerableProps.length;
        var constructor = obj.constructor;
        var proto = (isFunction(constructor) && constructor.prototype) || ObjProto;

- ¶

  Constructor is a special case.

        var prop = 'constructor';
        if (has(obj, prop) && !keys.contains(prop)) keys.push(prop);

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