Paweł Grzybek 7/7/2026

What's new in ECMAScript 2026

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This article provides a detailed overview of the new features introduced in the ECMAScript 2026 language specification, approved by Ecma International on June 30, 2026. It covers additions such as Array.fromAsync for converting async iterators to arrays, Error.isError for checking error types, Math.sumPrecise for precise summation, Uint8Array to/from Base64 conversion, Iterator sequencing, JSON.parse source text access, and the Upsert operation. The author explains each feature with code examples and context, making it useful for JavaScript developers keeping up with the latest language updates.

What's new in ECMAScript 2026

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