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; //
V8 release v7.5 · V8
Every six weeks, we create a new branch of V8 as part of our release process. Each version is branched from V8’s Git master immediately before a Chrome Beta milestone. Today we’re pleased to announce our newest branch, V8 version 7.5, which is in beta until its release in coordination with Chrome 75 Stable in several weeks. V8 v7.5 is filled with all sorts of developer-facing goodies. This post pr
V8の Object.entries/values を高速化した - abcdefGets
V8のObject.entries/valuesを高速化したよというお話 Object.entires/values そもそもObject.entries、Object.valuesとは何かというと、 GitHub - tc39/proposal-object-values-entries: ECMAScript Proposal, specs, and reference implementation for Object.values/Object.entriesで提案されていた仕様である。 見事stage4まで到達して採用された。 仕様 機能をおさらいしておく Object.entries(O) const ret = Object.entries({a: 1, b: 2, c: 3}); console.log(ret) // [['a', 1], ['b', 2], ['c',
1
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
処理を実行中です
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
