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2019年6月25日のブックマーク (3件)
-
clavier 2019/06/25
- python
- iphone
- ssh
リンク -
Exploring a powerful SQL pattern: ARRAY_AGG, STRUCT and UNNEST
By Lak Lakshmanan It can be extremely cost-effective (both in terms of storage and in terms of query time) to use nested fields rather than flatten out all your data. Nested, repeated fields are very powerful, but the SQL required to query them looks a bit unfamiliar. So, it’s worth spending a little time with STRUCT, UNNEST and ARRAY_AGG. Using these three in combination also makes some kinds of
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Display Locking によるレンダリングの最適化と Async DOM | blog.jxck.io
Intro React や lit-html などにより、 DOM 操作の抽象化に加えて最適化が提供されることが一般的となった。 見方を変えれば、本来ブラウザがやるような最適化を、ライブラリが肩代わりしていると捉えることもできる。 これは、現在の標準 API には、規模が大きく処理が複雑なアプリケーションを開発する際に、足りてないものがあると考えることが可能だ。 課題の 1 つとして「DOM 操作が同期処理である」という点に着目し、 Async DOM という文脈でいくつかの提案が行われた。 今回は、その提案の 1 つであり Chrome で実装が進んでいる Display Locking について現状を解説する。 現状の DOM 操作の課題 まず、以下のような処理を考える。 body.appendChild($div) この処理が JS の途中で出現すれば、その瞬間 Window にある
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- 2019年6月26日
- 2019年6月25日
- 2019年6月24日
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