54 lines
1.9 KiB
JavaScript
54 lines
1.9 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 = doWhilst;
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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var _rest = require('lodash/rest');
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var _rest2 = _interopRequireDefault(_rest);
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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 [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
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* the order of operations, the arguments `test` and `iteratee` are switched.
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*
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* `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
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*
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* @name doWhilst
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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} iteratee - A function which is called each time `test`
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* passes. The function is passed a `callback(err)`, which must be called once
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* it has completed with an optional `err` argument. Invoked with (callback).
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* @param {Function} test - synchronous truth test to perform after each
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* execution of `iteratee`. Invoked with Invoked with the non-error callback
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* results of `iteratee`.
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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 `iteratee` has stopped.
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* `callback` will be passed an error and any arguments passed to the final
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* `iteratee`'s callback. Invoked with (err, [results]);
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*/
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function doWhilst(iteratee, test, callback) {
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callback = (0, _onlyOnce2.default)(callback || _noop2.default);
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var next = (0, _rest2.default)(function (err, args) {
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if (err) return callback(err);
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if (test.apply(this, args)) return iteratee(next);
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callback.apply(null, [null].concat(args));
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});
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iteratee(next);
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}
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module.exports = exports['default'];
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