The latest JavaScript specification standardizes a well-balanced and thoughtful set of features, including the built-in global Iterator, new Set methods, improvements to regular expressions, and more.

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ECMAScript 2025 introduces several significant JavaScript features including a new built-in Iterator object with lazy evaluation and functional operators, new Set methods for mathematical operations like intersection and difference, direct JSON module imports, improved regular expression capabilities with inline modifier flags and escape methods, Promise.try for unified error handling, and Float16Array for high-performance computing applications.

ECMAScript 2025: The best new features in JavaScript