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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I went down the rabbit hole of Stage 1 proposals last night and I’m excited to see a few of those get traction

Thanks. Twitter will use this to make your timeline better. UndoUndo
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.