They are a language construct used for synchronizing execution in concurrent programming environments. Originally they were designed to decouple variable values from the time and place of their calculation, making parallelisation easier. Later, they were re-discovered for their ability to simplify asynchronous code by moving it to a more direct style rather than the continuation passing style necessitated without them.
If you haven’t tried it yet, here are a bunch of reasons with examples why you should adopt it immediately and never look back. [EDIT]: It seems that the embedded code on gist does not work on medium native app, but it works on mobile browsers. If you are reading this on the app, tap on the share icon and choose “open in browser” in order to see code snippets. ES7 Async/Await pitfalls – Matan Sokolovsky – Medium. What is async/await?
Thanks to all of SitePoint’s peer reviewers for making SitePoint content the best it can be! Often we need to represent an idea or concept in our programs—maybe a car engine, a computer file, a router, or a temperature reading. Representing these concepts directly in code comes in two parts: data to represent the state and functions to represent the behavior.
When 'not' to use arrow functions. It is a pleasure to see the evolution of the programming language you code every day.
For instance, you may be after a query string parameter value, and start by storing an entire URL, then just the query string, then the value. This practice should be avoided. 4. Core ES6 features. This chapter describes the core ES6 features. These features are easy to adopt; the remaining features are mainly of interest to library authors. I explain each feature via the corresponding ES5 code. 4.1 From var to let/const In ES5, you declare variables via var. Such variables are function-scoped, their scopes are the innermost enclosing functions. That func() returns undefined may be surprising.