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Reactには、パフォーマンス最適化のためのAPIがいくつかあります。具体的にはReact.memo、useMemo、そしてuseCallbackです。 React.memoで囲まれた関数コンポーネントは、propsが以前と変わっていない場合に再レンダリングが抑制されます。 また、useMemoやuseCallbackは、関数コンポーネント内での値の再計算を抑制する効果を持ちます。 これらは最適化のためのツールなので、「過度な最適化」を避けるように啓蒙する言説がよく見られます。 すなわち、ちゃんと本当に最適化のために必要なところにだけこれらを使おうということです。 特に、React.memoはpropsが以前と変わっているかどうかを判定するためのオーバーヘッドがあるし、useMemoやuseCallbackもフック呼び出しのオーバーヘッドがあります。 意味がないところでReact.memo
Author:@deeeeeeet, Engineering manager of Microservices SRE The Microservices SRE team is one of the Developer Productivity Engineering Camp teams. The team provides embedded SRE service to the product team. By working with/inside the product team, we improve the service reliability and share SRE practices with the team so that the team can maintain its reliability without SRE members. We rotate e
Author: @deeeeeeeet Platform Developer Experience (DX) team is one of the Developer Productivity Engineering Camp teams. It focuses on providing a state-of-the-art developer experience where product teams can take full end-to-end service ownership without any frictions so that they can deliver great products to Mercari customers faster and easier. In this blog post, in the beginning, I will explai
OpenSSH Release Notes OpenSSH 9.8/9.8p1 (2024-07-01) OpenSSH 9.8 was released on 2024-07-01. It is available from the mirrors listed at https://www.openssh.com/. OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support. Once again, we would like to thank the OpenSSH community for their continued support of the project, especially those who contributed
Author: Damien Miller <djm@openssh.com> Last modified: 2022-01-10 TLDR OpenSSH 8.9 will include the ability to control how and where keys in ssh-agent may be used, both locally and when forwarded (subject to some limitations). Background The OpenSSH SSH protocol implementation includes the ssh-agent authentication agent. This tool supports two overlapping uses: a safe runtime store for unwrapped p
An examination of translating text to make it as accessible as possible. Looking at how to make writing easier to read The following is a toggle that allows you to change whether the text is standard or translated into plain language. Press the p key at any time to switch between standard and plain language versions of the article. If you are using a screen reader, you will need to disable your th
When to use HTTPS for local development Stay organized with collections Save and categorize content based on your preferences. Using http://localhost for local development is fine most of the time, except in some special cases. This post explains when you need to run your local development site with HTTPS. Also see: How to use HTTPS for local development. In this post, statements about localhost a
Amazon Elastic Block Store (EBS) is a high-performance, cloud-based block storage system designed to work with Amazon Elastic Compute Cloud (EC2). EC2 instances are secure, resizable allotments of computing capacity running in the cloud. EBS allows customers to create high-performance storage volumes and attach them to their EC2 instances. These volumes behave much like local hard drives on your P
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