67 lines
2.0 KiB
JavaScript
67 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 = whilst;
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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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* Repeatedly call `fn`, while `test` returns `true`. Calls `callback` when
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* stopped, or an error occurs.
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*
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* @name whilst
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {Function} test - synchronous truth test to perform before each
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* execution of `fn`. Invoked with ().
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* @param {Function} iteratee - 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 and any arguments passed to the final `fn`'s
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* callback. Invoked with (err, [results]);
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* @returns undefined
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* @example
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*
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* var count = 0;
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* async.whilst(
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* function() { return count < 5; },
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* function(callback) {
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* count++;
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* setTimeout(function() {
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* callback(null, count);
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* }, 1000);
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* },
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* function (err, n) {
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* // 5 seconds have passed, n = 5
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* }
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* );
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*/
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function whilst(test, iteratee, callback) {
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callback = (0, _onlyOnce2.default)(callback || _noop2.default);
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if (!test()) return callback(null);
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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()) 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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