forked from dachan/dach
61 lines
2.0 KiB
JavaScript
61 lines
2.0 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 = until;
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var _whilst = require('./whilst.js');
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var _whilst2 = _interopRequireDefault(_whilst);
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var _wrapAsync = require('./internal/wrapAsync.js');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Repeatedly call `iteratee` until `test` returns `true`. Calls `callback` when
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* stopped, or an error occurs. `callback` will be passed an error and any
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* arguments passed to the final `iteratee`'s callback.
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*
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* The inverse of [whilst]{@link module:ControlFlow.whilst}.
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*
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* @name until
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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 {AsyncFunction} test - asynchronous truth test to perform before each
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* execution of `iteratee`. Invoked with (callback).
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* @param {AsyncFunction} iteratee - An async function which is called each time
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* `test` fails. Invoked with (callback).
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* @param {Function} [callback] - A callback which is called after the test
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* function has passed and repeated execution of `iteratee` has stopped. `callback`
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* will be passed an error and any arguments passed to the final `iteratee`'s
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* callback. Invoked with (err, [results]);
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* @returns {Promise} a promise, if a callback is not passed
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*
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* @example
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* const results = []
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* let finished = false
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* async.until(function test(cb) {
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* cb(null, finished)
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* }, function iter(next) {
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* fetchPage(url, (err, body) => {
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* if (err) return next(err)
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* results = results.concat(body.objects)
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* finished = !!body.next
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* next(err)
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* })
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* }, function done (err) {
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* // all pages have been fetched
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* })
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*/
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function until(test, iteratee, callback) {
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const _test = (0, _wrapAsync2.default)(test);
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return (0, _whilst2.default)(cb => _test((err, truth) => cb(err, !truth)), iteratee, callback);
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}
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module.exports = exports['default'];
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