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Each function + * consumes the return value of the previous function. It is the equivalent of + * {@link async.compose} with the arguments reversed. + * + * Each function is executed with the `this` binding of the composed function. + * + * @name seq + * @static + * @memberOf async + * @see async.compose + * @category Control Flow + * @param {...Function} functions - the asynchronous functions to compose + * @returns {Function} a function that composes the `functions` in order + * @example + * + * // Requires lodash (or underscore), express3 and dresende's orm2. + * // Part of an app, that fetches cats of the logged user. + * // This example uses `seq` function to avoid overnesting and error + * // handling clutter. + * app.get('/cats', function(request, response) { + * var User = request.models.User; + * async.seq( + * _.bind(User.get, User), // 'User.get' has signature (id, callback(err, data)) + * function(user, fn) { + * user.getCats(fn); // 'getCats' has signature (callback(err, data)) + * } + * )(req.session.user_id, function (err, cats) { + * if (err) { + * console.error(err); + * response.json({ status: 'error', message: err.message }); + * } else { + * response.json({ status: 'ok', message: 'Cats found', data: cats }); + * } + * }); + * }); + */ +export default rest(function seq(functions) { + return rest(function(args) { + var that = this; + + var cb = args[args.length - 1]; + if (typeof cb == 'function') { + args.pop(); + } else { + cb = noop; + } + + reduce(functions, args, function(newargs, fn, cb) { + fn.apply(that, newargs.concat([rest(function(err, nextargs) { + cb(err, nextargs); + })])); + }, + function(err, results) { + cb.apply(that, [err].concat(results)); + }); + }); +}) +</code></pre> + +</div> + +<footer class="footer"> + Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.7)</span></a> +</footer> + +<script src="script/search_index.js"></script> +<script src="script/search.js"></script> +<script src="script/pretty-print.js"></script> +<script src="script/inherited-summary.js"></script> +<script src="script/test-summary.js"></script> +<script src="script/inner-link.js"></script> +<script src="script/patch-for-local.js"></script> +</body> +</html> |