Released in November 2017, Angular 5 followed closely the releases of versions 2 and 4, which arrived in September 2016 and March 2017, respectively, skipping over a version 3 designation. (Because the router for Angular already had reached version 4 by the time Angular 3 was due, Google just went right to calling the upgrade itself Angular 4.)
Although the original AngularJS JavaScript development framework already was a hit with developers, Google undertook a rewrite for the second generation, focused on better performance. “We couldn’t get more performance out of the old architecture,” Green said. Angular 2 was rewritten in TypeScript, Microsoft’s typed superset of JavaScript. “TypeScript let us do static analysis of source code. This is something we can’t do in JavaScript, so it becomes much more predictable,” Green said. TypeScript also lets Angular show developers errors in HTML templates.
Another feature added in Angular 2 was a compiler that sits in between written code and output shipped to a production application. This compiler optimizes the generation of template-rendering; code then can run at maximum speed in JavaScript virtual machines.
Angular 2 also offered a much cleaner component model. Interoperation with technologies such as web components was also a focus in Angular 2.
Angular 4, meanwhile, offered view-engine improvements and code-generation reductions. The Angular 4.3 upgrade, was released in July and featured HttpClient, which provided a smaller, easier-to-use library for making HTTP requests.
Angular 4.3 also has an attribute,
@.disabled, for conditionally disabling animations as well as new router life cycle events. Since the 4.0 version, Angular also enhanced animations so parent and child elements can be coordinated across page transitions.
0 comments:
Post a Comment