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Diffstat (limited to 'node_modules/async/whilst.js')
-rw-r--r-- | node_modules/async/whilst.js | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/node_modules/async/whilst.js b/node_modules/async/whilst.js new file mode 100644 index 000000000..e81c4608e --- /dev/null +++ b/node_modules/async/whilst.js @@ -0,0 +1,67 @@ +'use strict'; + +Object.defineProperty(exports, "__esModule", { + value: true +}); +exports.default = whilst; + +var _noop = require('lodash/noop'); + +var _noop2 = _interopRequireDefault(_noop); + +var _rest = require('lodash/rest'); + +var _rest2 = _interopRequireDefault(_rest); + +var _onlyOnce = require('./internal/onlyOnce'); + +var _onlyOnce2 = _interopRequireDefault(_onlyOnce); + +function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } + +/** + * Repeatedly call `fn`, while `test` returns `true`. Calls `callback` when + * stopped, or an error occurs. + * + * @name whilst + * @static + * @memberOf module:ControlFlow + * @method + * @category Control Flow + * @param {Function} test - synchronous truth test to perform before each + * execution of `fn`. Invoked with (). + * @param {Function} iteratee - A function which is called each time `test` passes. + * The function is passed a `callback(err)`, which must be called once it has + * completed with an optional `err` argument. Invoked with (callback). + * @param {Function} [callback] - A callback which is called after the test + * function has failed and repeated execution of `fn` has stopped. `callback` + * will be passed an error and any arguments passed to the final `fn`'s + * callback. Invoked with (err, [results]); + * @returns undefined + * @example + * + * var count = 0; + * async.whilst( + * function() { return count < 5; }, + * function(callback) { + * count++; + * setTimeout(function() { + * callback(null, count); + * }, 1000); + * }, + * function (err, n) { + * // 5 seconds have passed, n = 5 + * } + * ); + */ +function whilst(test, iteratee, callback) { + callback = (0, _onlyOnce2.default)(callback || _noop2.default); + if (!test()) return callback(null); + var next = (0, _rest2.default)(function (err, args) { + if (err) return callback(err); + if (test()) return iteratee(next); + callback.apply(null, [null].concat(args)); + }); + iteratee(next); +} +module.exports = exports['default'];
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