Mention non-compliant implementations of Map/Set in Environment Requirements #677
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…updates into Chinese (reactjs#677) * doc(cn): queueing-a-series-of-state-updates * Apply suggestions from code review Co-authored-by: Hao Jiang ᛋ <[email protected]> * Update beta/src/pages/learn/queueing-a-series-of-state-updates.md Co-authored-by: Hao Jiang ᛋ <[email protected]> --------- Co-authored-by: Hao Jiang ᛋ <[email protected]> Co-authored-by: Xavi Lee <[email protected]>
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IE11 has native Map/Set implementations, but they're not compliant with the ES6 spec
See "Browser compatibility" section:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
This came up after a bug was found in IE11 related to Map: facebook/react#12349. The fix was simple enough, but in the future React may want to use other Map/Set features that IE11 doesn't have so people should still polyfill to be safe.