79 lines
2.6 KiB
JavaScript
79 lines
2.6 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 = seq;
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var _reduce = require('./reduce.js');
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var _reduce2 = _interopRequireDefault(_reduce);
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var _wrapAsync = require('./internal/wrapAsync.js');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _promiseCallback = require('./internal/promiseCallback.js');
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Version of the compose function that is more natural to read. Each function
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* consumes the return value of the previous function. It is the equivalent of
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* [compose]{@link module:ControlFlow.compose} with the arguments reversed.
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*
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* Each function is executed with the `this` binding of the composed function.
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*
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* @name seq
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @see [async.compose]{@link module:ControlFlow.compose}
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* @category Control Flow
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* @param {...AsyncFunction} functions - the asynchronous functions to compose
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* @returns {Function} a function that composes the `functions` in order
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* @example
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*
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* // Requires lodash (or underscore), express3 and dresende's orm2.
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* // Part of an app, that fetches cats of the logged user.
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* // This example uses `seq` function to avoid overnesting and error
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* // handling clutter.
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* app.get('/cats', function(request, response) {
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* var User = request.models.User;
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* async.seq(
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* User.get.bind(User), // 'User.get' has signature (id, callback(err, data))
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* function(user, fn) {
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* user.getCats(fn); // 'getCats' has signature (callback(err, data))
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* }
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* )(req.session.user_id, function (err, cats) {
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* if (err) {
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* console.error(err);
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* response.json({ status: 'error', message: err.message });
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* } else {
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* response.json({ status: 'ok', message: 'Cats found', data: cats });
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* }
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* });
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* });
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*/
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function seq(...functions) {
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var _functions = functions.map(_wrapAsync2.default);
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return function (...args) {
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var that = this;
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var cb = args[args.length - 1];
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if (typeof cb == 'function') {
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args.pop();
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} else {
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cb = (0, _promiseCallback.promiseCallback)();
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}
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(0, _reduce2.default)(_functions, args, (newargs, fn, iterCb) => {
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fn.apply(that, newargs.concat((err, ...nextargs) => {
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iterCb(err, nextargs);
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}));
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}, (err, results) => cb(err, ...results));
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return cb[_promiseCallback.PROMISE_SYMBOL];
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};
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}
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module.exports = exports.default;
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