71 lines
2.1 KiB
JavaScript
71 lines
2.1 KiB
JavaScript
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'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 = during;
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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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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* Like [`whilst`]{@link module:ControlFlow.whilst}, except the `test` is an asynchronous function that
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* is passed a callback in the form of `function (err, truth)`. If error is
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* passed to `test` or `fn`, the main callback is immediately called with the
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* value of the error.
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*
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* @name during
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @see [async.whilst]{@link module:ControlFlow.whilst}
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* @category Control Flow
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* @param {Function} test - asynchronous truth test to perform before each
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* execution of `fn`. Invoked with (callback).
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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} [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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* @example
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*
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* var count = 0;
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*
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* async.during(
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* function (callback) {
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* return callback(null, count < 5);
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* },
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* function (callback) {
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* count++;
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* setTimeout(callback, 1000);
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* },
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* function (err) {
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* // 5 seconds have passed
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* }
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* );
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*/
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function during(test, fn, callback) {
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callback = (0, _onlyOnce2.default)(callback || _noop2.default);
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function next(err) {
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if (err) return callback(err);
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test(check);
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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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test(check);
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}
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module.exports = exports['default'];
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