Module specifiers: what’s new with ES modules?
Update 2018-12-20: Warning: This blog post is outdated! Consult “ECMAScript modules in Node.js: the new plan” for the latest information. Update 2017-05-11: Complete rewrite of Sect. “Why a new filename extension for ES modules?”. This blog post describes how module specifiers (the path-like IDs of modules) change with ECMAScript modules (ESM). There are a few subtle differences, compared to the f
ECMAScript 6 modules: the final syntax
Warning: This blog post is outdated. Instead, read chapter “Modules” in “JavaScript for impatient programmers”. At the end of July 2014, TC39 [1] had another meeting, during which the last details of the ECMAScript 6 (ES6) module syntax were finalized. This blog post gives an overview of the complete ES6 module system. Module systems for current JavaScript # JavaScript does not have built-in supp
Subclassing builtins in ECMAScript 6
[Update 2015-02-15] Newer version of this blog post: “Classes in ECMAScript 6 (final semantics)” In JavaScript, it is difficult to create sub-constructors of built-in constructors such as Array. This blog post explains the problem and possible solutions – including one that will probably be chosen by ECMAScript 6. The post is based on Allen Wirfs-Brock’s slides from a presentation he held on Janua
Iterables and iterators in ECMAScript 6
This blog post is outdated. Please read chapter “Iterables and iterators” in “Exploring ES6”. This blog post is part of a series on iteration in ES6: Iterables and iterators in ECMAScript 6 ES6 generators in depth ECMAScript 6 introduces a new interface for iteration, Iterable. This blog post explains how it works, which language constructs consume data via it (e.g., the new for-of loop) and which
ECMAScript 2017 (ES8): the final feature set
Check out my book (free online): “Exploring ES2016 and ES2017”. Update 2017-01-29: At the TC39 meeting in January 2017, the last feature of ECMAScript 2017, “Shared memory and atomics” advanced to stage 4. That means that its feature set is now complete, as listed below. The features of ECMAScript 2017 # Major new features: Async Functions (Brian Terlson) Shared memory and atomics (Lars T. Hansen
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Warning: This blog post is outdated.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
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