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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Backwards-compatible is OK, as was the case with the Array#sort change (love it, btw!). The previous specs said: "The sort is not necessarily stable" http://www.ecma-international.org/ecma-262/6.0/#sec-array.prototype.sort … I.e. "might be stable, might not -- don't you rely on this!"
Thanks. Twitter will use this to make your timeline better. UndoUndo
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