What’s New in JavaScript? Exploring the Latest Language Features
This article highlights recent JavaScript enhancements, including class member additions, private property checks with the in operator, top-level await, the error.cause property, the new .at() method for strings, arrays and array‑like objects, regex match indices, and the safer Object.hasOwn() utility for own‑property verification.
Adding new members to classes
Checking private properties using the in operator
Top‑level await in modules
error.cause indicating the underlying cause of an error
String, Array, and array‑like objects gain the .at() method
Regular expression match indices
Object.hasOwn (obj, propKey), a safe way to check if an object has its own own (non‑inherited) property
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