Optional chaining · V8

Long chains of property accesses in JavaScript can be error-prone, as any of them might evaluate to null or undefined (also known as “nullish” values). Checking for property existence on each step easily turns into a deeply-nested structure of if-statements or a long if-condition replicating the property access chain: // Error prone-version, could throw. const nameLength = db.user.name.length; //

[yaboot]

コードが ? だらけになる未来が見える

[htbman]

やっときたー！

[Funyapu]

よさげ。逆は無理かなぁ… db.user?.name = 'John'的なの欲しい

[soy-curd]

きたー

[efcl]

ECMAScript Proposal Stage 3であるOptional Chain(`?.`)とnullish coalescing `??` operatorについて。 `lodash.get`をどのように置き換えられるかの例など

[ebo-c]

Rubyの「ぼっち演算子(&.)」みたいなのキタ