'use strict';
|
|
Object.defineProperty(exports, "__esModule", {
|
value: true
|
});
|
exports.default = whilst;
|
|
var _noop = require('lodash/noop');
|
|
var _noop2 = _interopRequireDefault(_noop);
|
|
var _slice = require('./internal/slice');
|
|
var _slice2 = _interopRequireDefault(_slice);
|
|
var _onlyOnce = require('./internal/onlyOnce');
|
|
var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
|
|
var _wrapAsync = require('./internal/wrapAsync');
|
|
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
/**
|
* Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
|
* stopped, or an error occurs.
|
*
|
* @name whilst
|
* @static
|
* @memberOf module:ControlFlow
|
* @method
|
* @category Control Flow
|
* @param {Function} test - synchronous truth test to perform before each
|
* execution of `iteratee`. Invoked with ().
|
* @param {AsyncFunction} iteratee - An async function which is called each time
|
* `test` passes. Invoked with (callback).
|
* @param {Function} [callback] - A callback which is called after the test
|
* function has failed and repeated execution of `iteratee` has stopped. `callback`
|
* will be passed an error and any arguments passed to the final `iteratee`'s
|
* callback. Invoked with (err, [results]);
|
* @returns undefined
|
* @example
|
*
|
* var count = 0;
|
* async.whilst(
|
* function() { return count < 5; },
|
* function(callback) {
|
* count++;
|
* setTimeout(function() {
|
* callback(null, count);
|
* }, 1000);
|
* },
|
* function (err, n) {
|
* // 5 seconds have passed, n = 5
|
* }
|
* );
|
*/
|
function whilst(test, iteratee, callback) {
|
callback = (0, _onlyOnce2.default)(callback || _noop2.default);
|
var _iteratee = (0, _wrapAsync2.default)(iteratee);
|
if (!test()) return callback(null);
|
var next = function (err /*, ...args*/) {
|
if (err) return callback(err);
|
if (test()) return _iteratee(next);
|
var args = (0, _slice2.default)(arguments, 1);
|
callback.apply(null, [null].concat(args));
|
};
|
_iteratee(next);
|
}
|
module.exports = exports['default'];
|
