2ality - JavaScript and more em 26/06/2025
On 25 June 2025, the 129th Ecma General Assembly approved the ECMAScript 2025 language specification...
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2ality is a blog about JavaScript, TypeScript and web development. It was started in March 2005.
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2ality - JavaScript and more em 24/06/2025
In this blog post, we explore ways in which we can make regular expressions easier to use.
2ality - JavaScript and more em 21/06/2025
JavaScript has two common patterns:
Maps: We check the existence of a key via .has() before retriev...
2ality - JavaScript and more em 18/06/2025
In ECMAScript 2025, JavaScript gets a class Iterator with iterator helper methods. This class confli...
2ality - JavaScript and more em 15/05/2025
In this blog post, we explore how we can style text that we log to the console in Node.js.
Some of t...
2ality - JavaScript and more em 29/04/2025
Converting values to strings in JavaScript is more complicated than it might seem:
Most approaches ...
2ality - JavaScript and more em 13/04/2025
In this blog post we look at:
The current best practice for deploying library packages: .js, .js.ma...
2ality - JavaScript and more em 12/04/2025
In this blog post, we examine how we can test types in TypeScript:
First, we look at the library as...
2ality - JavaScript and more em 28/03/2025
In JavaScript, code has color: It is either synchronous or asynchronous. In this blog post, we explo...
2ality - JavaScript and more em 11/03/2025
Today’s announcement by Microsoft:
[...] we’ve begun work on a native port of the TypeScript compil...
2ality - JavaScript and more em 04/03/2025
In this blog post, we explore what unions and intersections of object types can be used for in TypeS...
2ality - JavaScript and more em 02/03/2025
Roughly, TypeScript is JavaScript plus type information. The latter is removed before TypeScript cod...
2ality - JavaScript and more em 27/02/2025
Read this blog post if you are a JavaScript programmer and want to get a rough idea of what using Ty...
2ality - JavaScript and more em 25/02/2025
Now that Node.js has built-in support for TypeScript, we can use it as the foundation of a simple pl...
2ality - JavaScript and more em 24/02/2025
In this blog post, we explore how we can test that complicated TypeScript types work as expected. To...
2ality - JavaScript and more em 23/02/2025
The TypeScript handbook makes an interesting statement: “Often, the checks in a conditional type wil...
2ality - JavaScript and more em 20/02/2025
I have published the repository nodejs-type-stripping which demonstrates how to implement a package ...
2ality - JavaScript and more em 19/02/2025
In this blog post, we look at the special TypeScript type never which, roughly, is the type of thing...
2ality - JavaScript and more em 17/02/2025
In this blog post, we explore two equivalent notations for Arrays in TypeScript: T[] and Array<T&...
2ality - JavaScript and more em 17/02/2025
In this blog post, we examine how TypeScript handles JavaScript symbols at the type level.
If you wa...