This year's JavaScript update features significant enhancements, most notably the introduction of a built-in global Iterator object that allows for functional operations on iterable objects. The new Iterator streamlines code by offering methods like map and filter with lazy evaluation, improving performance for large collections. Additional updates include new methods for Set objects, a direct import for JSON modules, enhancements to regular expressions, a Promise.try method for simplifying Promise chains, and a new Float16Array typed array, enriching the capabilities of JavaScript significantly.
The latest JavaScript specification introduces a built-in global Iterator object, enhancing the functional programming capabilities of iterable collections with improved lazy evaluation and syntax.
The Iterator global provides static and prototype methods for working with iterators, allowing existing iterable objects to gain functional operators like map and filter.
The new Promise.try method streamlines Promise chains, while improved regular expressions and a new Float16Array typed array enrich the language's capabilities.
Arrays are eager in their evaluation, leading to the creation of intermediate 'working arrays' during operations, contrasting with the new Iterator's lazy evaluation.
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