Which new ES2025 features most impact on modern web development, and how do they streamline iterator and error handling flows?

Investigates specific ES2025 syntax/functional improvements that simplify common tasks such as lazy iteration, promise-based error handling, and regex escaping.

Iterator Helpers add methods like .map(), .filter(), .take(), .toArray(), enabling lazy, functional iteration pipelines without full data materialization. Promise.try() wraps synchronous exceptions into rejected promises, eliminating boilerplate try/catch when mixing sync and async logic and improving error flow consistency. Regex.escape() safely quotes special characters in user input to build dynamic patterns securely. Set methods such as .union(), .intersection(), and .difference() simplify Set algebra without needing external libraries. These features reduce dependency on utility libraries, increase readability, and encourage immutable functional patterns.