ES X
summary
Covers the current status of ECMAScript proposals and when they land in engines: async iterators (for await...of) are finished (stage 4) and implemented in browsers, letting readable streams be iterable; private fields (using #) and decorators are around stage 3 with concrete syntax; optional chaining and numeric separators are progressing through the pipeline. Explains TC39 staging rules, an approximate one-year rollout cadence per feature, concrete code-level effects, and warns that Babel can polyfill many proposals but stage‑1 features may change semantics and are risky to rely on.
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chapters (10)
- 0:00Welcome
- 1:16ECMAScript vs JavaScript
- 3:06TC39 role
- 7:42Babel despite ES6+
- 8:49Async iterators in ES2018
- 15:44Private class fields
- 21:22Decorators for code
- 25:14Optional chaining
- 27:44Numeric separators
- 28:48Conclusion & Q&A
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