In this blog post, we take a look at the ECMAScript 2025 feature “Duplicate named capturing groups” which was proposed by Kevin Gibbons. It’s a feature for regular expressions that enables us to use the same capture group name more than once. The only restriction is that duplicates must exist in different alternatives – in other words: At any time, there can’t be more than one capture with a given name. Why is that useful? It lets us reuse regular expression fragments and match-processing code between alternatives.

2ality – JavaScript and more

20.05.2024

ECMAScript 2023 feature: symbols as WeakMap keys

In this blog post, we take a look at the ECMAScript 2023 feature “Symbols as WeakMap keys” – which was proposed by Robin Ricard, Rick Button, Daniel Ehrenberg, Leo Balter, Caridy Patiño, Rick Waldron, and Ashley Claymore.

2ality – JavaScript and more

01.06.2024

ECMAScript 2024 features: resizing and transferring ArrayBuffers

In this blog post, we examine ArrayBuffer features that were introduced in ECMAScript 2024: “In-place resizable ArrayBuffers”, proposed by Shu-yu Guo “ArrayBuffer.prototype.transfer and friends” proposed by Shu-yu Guo, Jordan Harband and Yagiz Nizipli

2ality – JavaScript and more

27.06.2024

Ecma International approves ECMAScript 2024: What’s new?

On 26 June 2024, the 127th Ecma General Assembly approved the ECMAScript 2024 language specification, which means that it’s officially a standard now. This blog post explains what’s new.

home›2ality – JavaScript and more

2ality – JavaScript and more

Software

ECMAScript proposal: duplicate named capturing groups for regular expressions

ECMAScript 2023 feature: symbols as WeakMap keys

ECMAScript 2024 features: resizing and transferring ArrayBuffers

Ecma International approves ECMAScript 2024: What’s new?

home
›
2ality – JavaScript and more