1 | ;
|
2 |
|
3 | Object.defineProperty(exports, "__esModule", {
|
4 | value: true
|
5 | });
|
6 | exports.default = whilst;
|
7 |
|
8 | var _noop = require('lodash/noop');
|
9 |
|
10 | var _noop2 = _interopRequireDefault(_noop);
|
11 |
|
12 | var _slice = require('./internal/slice');
|
13 |
|
14 | var _slice2 = _interopRequireDefault(_slice);
|
15 |
|
16 | var _onlyOnce = require('./internal/onlyOnce');
|
17 |
|
18 | var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
|
19 |
|
20 | var _wrapAsync = require('./internal/wrapAsync');
|
21 |
|
22 | var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
|
23 |
|
24 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
25 |
|
26 | /**
|
27 | * Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
|
28 | * stopped, or an error occurs.
|
29 | *
|
30 | * @name whilst
|
31 | * @static
|
32 | * @memberOf module:ControlFlow
|
33 | * @method
|
34 | * @category Control Flow
|
35 | * @param {Function} test - synchronous truth test to perform before each
|
36 | * execution of `iteratee`. Invoked with ().
|
37 | * @param {AsyncFunction} iteratee - An async function which is called each time
|
38 | * `test` passes. Invoked with (callback).
|
39 | * @param {Function} [callback] - A callback which is called after the test
|
40 | * function has failed and repeated execution of `iteratee` has stopped. `callback`
|
41 | * will be passed an error and any arguments passed to the final `iteratee`'s
|
42 | * callback. Invoked with (err, [results]);
|
43 | * @returns undefined
|
44 | * @example
|
45 | *
|
46 | * var count = 0;
|
47 | * async.whilst(
|
48 | * function() { return count < 5; },
|
49 | * function(callback) {
|
50 | * count++;
|
51 | * setTimeout(function() {
|
52 | * callback(null, count);
|
53 | * }, 1000);
|
54 | * },
|
55 | * function (err, n) {
|
56 | * // 5 seconds have passed, n = 5
|
57 | * }
|
58 | * );
|
59 | */
|
60 | function whilst(test, iteratee, callback) {
|
61 | callback = (0, _onlyOnce2.default)(callback || _noop2.default);
|
62 | var _iteratee = (0, _wrapAsync2.default)(iteratee);
|
63 | if (!test()) return callback(null);
|
64 | var next = function (err /*, ...args*/) {
|
65 | if (err) return callback(err);
|
66 | if (test()) return _iteratee(next);
|
67 | var args = (0, _slice2.default)(arguments, 1);
|
68 | callback.apply(null, [null].concat(args));
|
69 | };
|
70 | _iteratee(next);
|
71 | }
|
72 | module.exports = exports['default']; |
\ | No newline at end of file |