async.js

I have a simple timeout function which wraps an async function with a timeout to ensure that it fails after a preset amount of time. The timeout function is as follows: export default async function<T = any>( fn: Promise<T>, ms: number, identifier: string = "" ): Promise<T> { let completed = false; const timer = setTimeout(() => { if (completed === false) { const e = new Error(`Timed out after ${ms}ms [ ${identifier} ]`); e.name = "TimeoutError"; throw e; } }, ms); const results = await fn; completed = true; timer.unref(); return results; } I then use this function in this simple code snippet

I am using async module with waterfall method. async.waterfall([ function(callback) { ... callback(err); }, function(result, callback) { console.log("This function should not be executed"); } ], function(err) { if (err) { next(err); return; } } ); But the second function always execute. How to prevent it? Try adding a return async.waterfall([ function(callback) { ... return callback(err); //note return here }, function(result, callback) { console.log("This function should not be executed"); } ], function(err) { if (err) { next(err); return; } } ); 来源： https://stackoverflow.com/questions

I'm using node.js and the async package. Here's the code I have: async.waterfall( [ function(callback) { var data = getSomeData(); callback(null, data); }, function(data, callback) { someFunctionThatNeedsData(data); callback(null, 'done'); } ], function(err, result) { } ); getSomeData has an asynchronous HTTP request that grabs some data from a web service. I'd like to wait until I get a response, and then return that data and pass it to someFunctionThatNeedsData . What I expected was that getSomeData -- including the callback inside of it -- would have to complete before moving on to invoke

I'm working on a project that involves making multiple HTTP GET requests to different APIs, each requiring information from the last. I'm trying to avoid nested-callaback-and-counter-hell, and have been trying to get it working with the async module. This is what I need to do: I have an array of 1..n course identifiers ( ['2014/summer/iat/100/d100', '2014/spring/bisc/372/d100'] ). For each course in the array, I need to fetch its course outline via a HTTP GET. The resulting outline looks something like this: { "info": { "nodePath": "2014/spring/bisc/372/d100", "number": "372", "section": "D100

I am unfortunately new to node and running into some confusion regarding the asynchronous/synchronous execution of node. I am using node, sequelize with sqlite and async.js. I have a series of Articles , each of which has a number of Authors . For each Authors in each Article , I'd like to check if the Author exists. If not, create it. The problem is, on the initial run, duplicate authors are being created, I assume due to asynchronous functionality causing an issue with checking for existence. For example, with the array: authors = ['A. Test', 'B. Test', 'C. Test', 'A. Test'] and the code: