New JavaScript features in ES2019:
Array#{flat,flatMap}
Object.fromEntries
String#{trimStart,trimEnd}
Symbol#description
try { } catch {} // optional binding
JSON ⊂ ECMAScript
well-formed JSON.stringify
stable Array#sort
revised Function#toString
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Replying to @rauschma
Not a formal proposal, but I presented on it multiple times at TC39, and today the PR got consensus and was merged:https://github.com/tc39/ecma262/pull/1340 …
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