1var toArray = require('./toArray');
2
3/**
4 * Gets the next value on a wrapped object following the
5 * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
6 *
7 * @name next
8 * @memberOf _
9 * @since 4.0.0
10 * @category Seq
11 * @returns {Object} Returns the next iterator value.
12 * @example
13 *
14 * var wrapped = _([1, 2]);
15 *
16 * wrapped.next();
17 * // => { 'done': false, 'value': 1 }
18 *
19 * wrapped.next();
20 * // => { 'done': false, 'value': 2 }
21 *
22 * wrapped.next();
23 * // => { 'done': true, 'value': undefined }
24 */
25function wrapperNext() {
26  if (this.__values__ === undefined) {
27    this.__values__ = toArray(this.value());
28  }
29  var done = this.__index__ >= this.__values__.length,
30      value = done ? undefined : this.__values__[this.__index__++];
31
32  return { 'done': done, 'value': value };
33}
34
35module.exports = wrapperNext;
36