Destructuring and parameter handling in ECMAScript 6
Warning: This blog post is outdated. Instead, read chapter “Destructuring” and section “Parameter handling” in “JavaScript for impatient programmers”. ECMAScript 6 (ES6) supports destructuring, a convenient way to extract values from data stored in (possibly nested) objects and arrays. This blog post describes how it works and gives examples of its usefulness. Additionally, parameter handling rece
One JavaScript: avoiding versioning in ECMAScript 6
What is the best way to add new features to a language? This blog post describes the approach taken by ECMAScript 6 [1], the next version of JavaScript. It is called One JavaScript, because it avoids versioning. Versioning # In principle, a new version of a language is a chance to clean it up, by removing outdated features or by changing how features work. That means that new code doesn’t work in
Symbols in ECMAScript 6
TODO: Mention early what their main purpose is, what they are good for. Symbols are a new primitive type in ECMAScript 6 [1]. This blog post explains how they work. A new primitive type # ECMAScript 6 introduces a new primitive type: symbols. They are tokens that serve as unique IDs. You create symbols via the factory function Symbol() (which is loosely similar to String returning strings if call
ECMAScript 6: new OOP features besides classes
This blog post is outdated. Please read chapter “New OOP features besides classes” in “Exploring ES6”. Classes [1] are the major new OOP feature in ECMAScript 6 [2]. However, it also includes new features for object literals and new utility methods in Object. This blog post describes them. New features of object literals # Method definitions # In ECMAScript 5, methods are properties whose values
ECMAScript 6 modules in future browsers
Update 2013-11-22: David Herman has published the slide deck “Status Report: ES6 Modules”. [1] is an introduction to ECMAScript 6 modules and how they can be used in current browsers. In contrast, this blog post explains how future browsers will support them natively. As part of that support, we will get the <module> tag, a better version of the <script> tag. Browsers: asynchronous modules, synchr
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