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Dir : ~/usr/share/nodejs/core-js-pure/internals/

View File Name : object-iterator.js

'use strict';
var InternalStateModule = require('../internals/internal-state');
var createIteratorConstructor = require('../internals/iterator-create-constructor');
var createIterResultObject = require('../internals/create-iter-result-object');
var hasOwn = require('../internals/has-own-property');
var objectKeys = require('../internals/object-keys');
var toObject = require('../internals/to-object');

var OBJECT_ITERATOR = 'Object Iterator';
var setInternalState = InternalStateModule.set;
var getInternalState = InternalStateModule.getterFor(OBJECT_ITERATOR);

module.exports = createIteratorConstructor(function ObjectIterator(source, mode) {
  var object = toObject(source);
  setInternalState(this, {
    type: OBJECT_ITERATOR,
    mode: mode,
    object: object,
    keys: objectKeys(object),
    index: 0
  });
}, 'Object', function next() {
  var state = getInternalState(this);
  var keys = state.keys;
  while (true) {
    if (keys === null || state.index >= keys.length) {
      state.object = state.keys = null;
      return createIterResultObject(undefined, true);
    }
    var key = keys[state.index++];
    var object = state.object;
    if (!hasOwn(object, key)) continue;
    switch (state.mode) {
      case 'keys': return createIterResultObject(key, false);
      case 'values': return createIterResultObject(object[key], false);
    } /* entries */ return createIterResultObject([key, object[key]], false);
  }
});