ECMAScript 2019, or ES2019, introduces several new features to enhance JavaScript's functionality and streamline coding practices. Among the key additions are the Object.fromEntries() method, which reverses Object.entries() by converting key-value pairs into an object, and the trimStart() and trimEnd() methods, which offer consistency with padStart() and padEnd(). The flat() and flatMap() methods simplify array manipulation by flattening nested arrays and combining mapping and flattening operations, respectively. ES2019 also adds a description property to Symbol objects, enhancing debugging by providing direct access to symbol descriptions, and introduces optional catch binding, allowing try-catch statements without specifying an error object. These features, already supported by the latest versions of Firefox and Chrome, can also be used in older browsers via transpilers like Babel. The annual release cycle by TC39 ensures that JavaScript continues to evolve rapidly, benefiting developers with more efficient and expressive tools.