60 lines
2.0 KiB
JavaScript
60 lines
2.0 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = doDuring;
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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var _baseRest = require('lodash/_baseRest');
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var _baseRest2 = _interopRequireDefault(_baseRest);
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var _onlyOnce = require('./internal/onlyOnce');
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var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* The post-check version of [`during`]{@link module:ControlFlow.during}. To reflect the difference in
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* the order of operations, the arguments `test` and `fn` are switched.
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*
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* Also a version of [`doWhilst`]{@link module:ControlFlow.doWhilst} with asynchronous `test` function.
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* @name doDuring
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @see [async.during]{@link module:ControlFlow.during}
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* @category Control Flow
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* @param {Function} fn - A function which is called each time `test` passes.
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* The function is passed a `callback(err)`, which must be called once it has
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* completed with an optional `err` argument. Invoked with (callback).
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* @param {Function} test - asynchronous truth test to perform before each
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* execution of `fn`. Invoked with (...args, callback), where `...args` are the
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* non-error args from the previous callback of `fn`.
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* @param {Function} [callback] - A callback which is called after the test
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* function has failed and repeated execution of `fn` has stopped. `callback`
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* will be passed an error if one occured, otherwise `null`.
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*/
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function doDuring(fn, test, callback) {
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callback = (0, _onlyOnce2.default)(callback || _noop2.default);
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var next = (0, _baseRest2.default)(function (err, args) {
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if (err) return callback(err);
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args.push(check);
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test.apply(this, args);
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});
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function check(err, truth) {
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if (err) return callback(err);
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if (!truth) return callback(null);
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fn(next);
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}
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check(null, true);
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}
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module.exports = exports['default']; |