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Viewing file:     _collectNonEnumProps.js (1.33 KB)      -rw-r--r--

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);
    }
  }
}