Thanks to all of SitePoint’s peer reviewers for making SitePoint content the best it can be! Almost every developer has had the experience of maintaining or taking over a legacy project. Or, maybe it’s an old project which got picked up again. Common first thoughts are to throw away the code base, and start from scratch. The code can be messy, undocumented and it can take days to fully understand everything.
Introduction to Babel. Introduction to Babel. Making ES6 happen with ChakraCore and Node - Christian Heilmann. Learning ES6: Classes. We’re going from enhanced object literals that look a lot like classes to actual classes in ES6.
[fb-optin-form uid='' nofollow=false style='main' titletext='You can also get the feed via email. Sign up now by supplying your email address and clicking the Subscribe button' nonloggedonly=false] As I’ve mentioned before, I’m in the middle of putting together a React reference app and I’m doing it using Test Driven Development. The problem is, the standard tools for implementing ES2015 code coverage with Jest make it hard to see at a glance if you have 100% code coverage or not because of some issues with the way Jest tells Babel to do the transformations by default, the way Babel transforms the code and implements the auxiliaryCommentBefore option and the way that Istanbul parses the ignore next comments.
It’s been around for a while, but with the introduction of class syntax in ES6, it’s not immediately obvious how to use it to add properties to a class, as opposed to an instantiated object. ES6 (now renamed ES 2015) adds syntactic sugar to support the appearance of traditional class inheritance. Now, rather than using prototypical inheritance directly, it’s possible to write code that looks more familiar when coming from other languages: In some cases, such as for data model classes, there might be a large number of properties.