Abstract
JavaScript has become more and more popular in recent years because its wealthy features as being dynamic, interpreted and object-oriented with first-class functions. Furthermore, JavaScript is designed with event-driven and I/O non-blocking model that boosts the performance of overall application especially in the case of Node.js. To take advantage of these characteristics, many design patterns that implement asynchronous programming for JavaScript were proposed. However, choosing a right pattern and implementing a good asynchronous source code is a challenge and thus easily lead into less robust application and low quality source code. Extended from our previous works on exception handling code smells in JavaScript and exception handling code smells in JavaScript asynchronous programming with promise, this research aims at studying the impact of three JavaScript asynchronous programming patterns on quality of source code and application.
Highlights
The very first JavaScript asynchronous error handling pattern is the “error-first callback” pattern, which was introduced in Node.js
Error handling with promise now is easier, likely using try catch in synchronous programming because all the asynchronous operation are at the same source code level
Beside the two errors handling code smells we analyzed in [6]: “Error swallowing in onRejected handler” and “Missing error handling at the end of promise chain”, in this paper we study a new error handling code smell: “Missing global rejected promise to handle code smell”
Summary
The very first JavaScript asynchronous error handling pattern is the “error-first callback” pattern, which was introduced in Node.js. This is a standard for callback throughout Node.js. If the requested asynchronous operation was failed, it would provide an error object as the first argument of the callback. If the reading process failed, the callback function will be invoked with the err parameter is not null. This parameter contains the error of the file reading process. Err will be set to null and the data contains the content of the requested file
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
