リクルートアドベントカレンダーの20日目の記事です。 adventar.org 最初にこの疑問を思ったのは、今も忘れない R-ISUCON 2021 というリクルートの社内ISUCONの運営で炎上していた時の話です。 ちなみに R-ISUCON 2021 は劇的な結果で終わっているので、興味のある方は見てみてください。 blog.recruit.co.jp R-ISUCON 2021 では、 Node.js (TypeScript), Go, Java の3パターンの実装が出てくることが通例になっていまして、今回は Java の実装から Node.js, Go に適用していた時に一緒に実装していたメンバーからの疑問が『例外には色々な議論があるけれど、「例外を初めて実装した言語」ってどういう気持ちで実装したんだろう』という話が挙げられたので、そのネタを持ってきました。 ちなみにここで指してい
Stop Saying Rust Is Complicated Rust often gets labeled as “too hard” or “too complicated” because it forces you to think carefully about memory, concurrency, and error handling. But here’s the catch: those aren’t just “Rust problems.” They’re software engineering problems that show up in any sufficiently complex system. Rust’s approach may feel strict, but it’s essentially teaching you fundamenta
Simplifying serverless best practices with AWS Lambda Powertools for TypeScript | Amazon Web Services
AWS Compute Blog Simplifying serverless best practices with AWS Lambda Powertools for TypeScript This blog post is written by Sara Gerion, Senior Solutions Architect. Development teams must have a shared understanding of the workloads they own and their expected behaviors to deliver business value fast and with confidence. The AWS Well-Architected Framework and its Serverless Lens provide architec
はじめに はじめまして。インターンをしているイナです。 今回は初心者がGo言語の例外処理がないって本当なの？という部分について概念を中心に調べたものをまとめました。 Q. 例外処理とは まずは兎にも角にも、例外処理とはなんぞやってところからです。 いくつかのサイトで例外処理の定義について調べてみましたが、サイトによって言ってることはバラバラでした。 例外とエラーは一緒です or 違います！例外は想定外 or 想定内&想定外のエラーのことです！など人によって言ってることが違いました。 最初から壁が高すぎ...?と戦々恐々としていましたが、IT用語辞典 e-Wordで気になる部分がありました。 例外は「エラー」（error）と同種の概念で、普遍的に成り立つ両者の明確な違いは無く、同義として扱われる場合が多い。ただし、プログラミング言語や処理系によっては両者に異なる意味合いが与えられている場合も
Programming is an iterative process. As much as we would like to come up with the perfect solution from the start, it rarely works that way. Good programs often begin as quick prototypes. While many experiments remain prototypes, the best programs can evolve into production code. Whether you’re writing games, CLI tools, or designing library APIs, prototyping helps tremendously in finding the best
Today we’re excited to announce the release of TypeScript 5.2! If you’re not familiar with TypeScript, it’s a language that builds on top of JavaScript by making it possible to declare and describe types. Writing types in our code allows us to explain intent and have other tools check our code to catch mistakes like typos, issues with null and undefined, and more. Types also power TypeScript’s edi
Posted on September 8, 2025 I get asked on my stream and at talks I give, “What is it like to work in Haskell in production, full-time?” From November of 2020 until August 2025, I was employed at Mercury where I wrote code in Haskell. During that time I also started up a live video stream where I’ve built several libraries, games, and applications in Haskell for an audience. This post is a summary
Today we’re excited to announce our Release Candidate of TypeScript 5.2! Between now and the stable release of TypeScript 5.2, we expect no further changes apart from critical bug fixes. To get started using the RC, you can get it through NuGet, or through npm with the following command: npm install -D typescript@rc Here’s a quick list of what’s new in TypeScript 5.2! using Declarations and Explic
Python's "Type Hints" are a bit of a disappointment to me
blog - git - desktop - images - contact Python's "Type Hints" are a bit of a disappointment to me 2022-04-21 Preface You are reading version 2.0 of this blog post. I've incorporated some feedback I got into this revised version. Introduction Over the course of several Python 3.x versions, "type hints" were introduced. You can now annotate functions: def greeting(name: str) -> str: return 'Hello '
A Walk with LuaJIT
The following is a chronicle of implementing a general purpose zero-instrumentation BPF based profiler for LuaJIT. Some assumptions are made about what this entails and it may be helpful to read some of our other work in this area. One major change from prior efforts is that instead of working with the original Parca unwinder we are now working with the OpenTelemetry eBPF profiler. If you missed t
Wasm core dumps and debugging Rust in Cloudflare Workers
Wasm core dumps and debugging Rust in Cloudflare Workers2023-08-14 A clear sign of maturing for any new programming language or environment is how easy and efficient debugging them is. Programming, like any other complex task, involves various challenges and potential pitfalls. Logic errors, off-by-ones, null pointer dereferences, and memory leaks are some examples of things that can make software
これらのクレームはあくまで標準として定義されているものであり、発行元によってはこれらに加えて独自のクレームが含まれることになります。例えばCognitoでは、トークン用途を表す token_useといった独自のクレームが含まれます。 また、JWTで使用する形式には、JSON Web Signature（以下JWS）とJSON Web Encryption（以下JWE）の2種類があります。JWSはRFC7515、JWEはRFC7516でそれぞれ定義されています。簡単な特徴としては、JWSでは電子署名がされる、JWEでは暗号化されるといった点が挙げられます。これらは組み合わせることも可能であり、IDトークンではJWSによる電子署名は必須となっているため、JWSについては必ず使用されることになります。 これらの仕様により、IDトークンではクレームを参照することでユーザー情報を確認でき、また電子署
Statically typed programming languages can help catch mismatches between the kinds of values a program is intended to manipulate, and the values it actually manipulates. While there have been many bytes spent on discussions of whether this is worth the effort, some programming language designers believe that the type checking in current languages does not go far enough. Koka, an experimental funct
Tier 4 Support § Support for these targets is entirely experimental. If this target is provided by LLVM, LLVM may have the target as an experimental target, which means that you need to use Zig-provided binaries for the target to be available, or build LLVM from source with special configure flags. zig targets will display the target if it is available. This target may be considered deprecated by
Summary Introduce virtual threads to the Java Platform. Virtual threads are lightweight threads that dramatically reduce the effort of writing, maintaining, and observing high-throughput concurrent applications. This is a preview API. Goals Enable server applications written in the simple thread-per-request style to scale with near-optimal hardware utilization. Enable existing code that uses the j
If you are a Rubyist, you’ve likely been writing # frozen_string_literal: true at the top of most of your Ruby source code files, or at the very least, that you’ve seen it in some other projects. Based on informal discussions at conferences and online, it seems that what this magic comment really is about is not always well understood, so I figured it would be worth talking about why it’s there, w
その try-catch、意味がありますか？NestJSにおける例外処理の戦略 | TrustHub テックブログ
弊社（トラストハブ）では、バックエンドのプログラミング言語として TypeScript、ウェブフレームワークとしてNestJSを採用しています。本記事では、NestJSの特長を生かした、実際に弊社で採用されている例外処理の戦略について述べます。 その try-catch、意味がありますか？ TypeScriptのコードにおいて、try-catch が使われている場面をたびたび見かけます。 try-catch で囲う意図としては以下のようなものがあると思います。 例外をハンドリングすることで処理を継続したい。 例外の型によって処理を分岐したい。 例外の内容をログに出力したい。 例外をハンドリングする必要がありますか 例外は、例外的な状態なので例外なのです。 例外が発生した多くの場合、書かれたコードでは処理を継続できない状況が発生します。処理を継続できない状況において、例外を catch して
Today we are excited to announce the availability of TypeScript 5.2 Beta. To get started using the beta, you can get it through NuGet, or through npm with the following command: npm install -D typescript@beta Here’s a quick list of what’s new in TypeScript 5.2! using Declarations and Explicit Resource Management Decorator Metadata Named and Anonymous Tuple Elements Easier Method Usage for Unions o
この記事は以下のブログの翻訳記事で、著者の許諾のもと翻訳しています。翻訳過程で機械翻訳を活用しており、原典と翻訳を十分に照らし合わせて内容が正しいことを確認しておりますが、細かいニュアンスなどが気になる場合は原典をご確認ください。また、誤訳などあればtwitterにてご連絡いただけたら修正いたします。 medium.com 目次 目次 イントロ 例外(Exceptions) 型付きエラー処理(Typed Error Handling) 比較研究 実験結果 6位: 早期returnなしのsealed classマッチング 5位: Either<L, R> のflatMapチェーン 4位: 例外と再スロー(rethrow) 3位: 早期returnありのsealed classマッチング 2位: Arrowの either { } ビルダー 1位: Arrowの context(Raise<E
July 2, 2025 Volume 23, issue 3 PDF When Is WebAssembly Going to Get DOM Support? Or, how I learned to stop worrying and love glue code Daniel Ehrenberg Is WebAssembly (Wasm) really ready for production usage in web applications, even though that usage requires integration with a web page and the APIs used to manipulate it, such as the DOM? Simultaneously, the answer to this question is that "Wasm
Try Mastering Emacs for free! Are you struggling with the basics? Have you mastered movement and editing yet? When you have read Mastering Emacs you will understand Emacs. It’s that time again: there’s a new major version of Emacs and, with it, a treasure trove of new features and changes. Notable features include the formal inclusion of native compilation, a technique that will greatly speed up y
Technology Trends for 2024
This has been a strange year. While we like to talk about how fast technology moves, internet time, and all that, in reality the last major new idea in software architecture was microservices, which dates to roughly 2015. Before that, cloud computing itself took off in roughly 2010 (AWS was founded in 2006); and Agile goes back to 2000 (the Agile Manifesto dates back to 2001, Extreme Programming t
Safer Usage Of C++
Safer Usage Of C++ This document is PUBLIC. Chromium committers can comment on the original doc. If you want to comment but can’t, ping palmer@. Thanks for reading! Google-internal short link: go/safer-cpp Authors/Editors: adetaylor, palmer Contributors: ajgo, danakj, davidben, dcheng, dmitrig, enh, jannh, jdoerrie, joenotcharles, kcc, markbrand, mmoroz, mpdenton, pkasting, rsesek, tsepez, awhalle
Exceptions kind of suck in Haskell. You don’t get a stack trace. They don’t show up in the types of functions. They incorporate a subtyping mechanism that feels more like Java casting than typical Haskell programming. A partial solution to the problem is HasCallStack - that gives us a CallStack which gets attached to error calls. However, it only gets attached to error - so you can either have Str
Join a VS Code Dev Days event near you to learn about AI-assisted development in VS Code. Update 1.56.1: The update addresses these security issues. Update 1.56.2: The update addresses these issues. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the April 2021 release of Visual Studio Code. The VS Code team has been busy this month working
IDEs CLion DataGrip DataSpell GoLand IntelliJ IDEA PhpStorm PyCharm RustRover Rider RubyMine WebStorm Plugins & Services Big Data Tools JetBrains Platform Scala Toolbox App JetBrains AI Grazie Junie JetBrains for Data Air Team Tools Datalore TeamCity YouTrack Qodana CodeCanvas Matter Databao .NET & Visual Studio .NET Tools ReSharper C++ Languages & Frameworks Kotlin Ktor MPS Amper Education & Rese
Temporal Python SDK: A durable, distributed asyncio event loop We are excited about the GA release of the Temporal Python SDK. Python is now a fully-supported workflow language in Temporal, and our use of native asyncio constructs makes it a perfect fit for Python developers looking to write durable workflows. Here are some links to read more about Temporal Python: Repository Application Developme
What's in the box?
Thanks to my sponsors: Aleksandre Khokhiashvili, Dragoon, Michal Hošna, Horváth-Lázár Péter, Nicolas Riebesel, old.woman.josiah, Dirkjan Ochtman, villem, Xirvik Servers, Geoffroy Couprie, Zalán Bálint Lévai, Valentin Mariette, David Cornu, Marty Penner, Sung Jeon, Geoffrey Thomas, Joshua Roesslein, Matt Jackson, pinkhatbeard, Santiago Lema and 262 more Here’s a sentence I find myself saying severa
定義する例外を減らしつつソフトウェアを設計する方法を"A Philosophy of Software Design"から学ぶ 会社の読書会で”A Philosophy of Software Design”を読んでいる。 自分の担当で第10章 “Define Errors Out Of Existence” をしっかり読む機会があり、けっこう興味深い内容なので読書メモをブログにも書いておく。 章タイトルについて 章タイトル”Define Errors Out Of Existence”は直訳すると「エラーが存在しないものとして定義する」。例外やエラーはプログラム中で定義するものなので”define”の語を使っている様子。 こなれた感じにするには「エラーがもとから存在しないようにする」ぐらいが妥当そう。本文中では”defining away”（”define”を使いつつ消し去るニュアンスを
Here is a list of common Android interview questions with detailed answers to help you prepare for the interview as an Android app developer. This article is designed to assist aspiring Android developers with a comprehensive set of interview questions, covering a wide spectrum of areas including basic programming principles, Android-specific components, design patterns, and best practices in mobi
Python Interview Questions
Here is a list of common Python interview questions with detailed answers to help you prepare for the interview as a Python developer. Python, with its versatile use cases and straightforward syntax, has seen its popularity growing continuously in software development, data science, artificial intelligence, and many other fields. As such, interviews for Python-related positions are designed not on
Introducing the Advanced JDBC Wrapper Driver for Amazon Aurora | Amazon Web Services
AWS Database Blog Introducing the Advanced JDBC Wrapper Driver for Amazon Aurora Today’s modern applications are expected to be scalable and resilient. The top of this list is scalability, which depending on the size of the application workload could mean the ability to handle millions of users on demand. With stateful applications such as eCommerce, Financial Services and Games, this means having
Django for Startup Founders: A better software architecture for SaaS startups and consumer apps
In an ideal world, startups would be easy. We'd run our idea by some potential customers, build the product, and then immediately ride that sweet exponential growth curve off into early retirement. Of course it doesn't actually work like that. Not even a little. In real life, even startups that go on to become billion-dollar companies typically go through phases like: Having little or no growth fo
This blog is where I post up various half-baked ideas that I have. All PostsCategoriesGitHubTwitterRSS/Atom feedsSelected posts: The borrow checker withinEmpathy in open source: be gentle with each other I’ve been thinking a wild thought lately: we should deprecate panic=unwind. Most production users I know either already run with panic=abort or use unwinding in a very limited fashion, basically j
[Simon Tatham, initial version 2023-09-01, last updated 2025-03-25] [Coroutines trilogy: C preprocessor | C++20 native | general philosophy ] Introduction Why I’m so enthusiastic about coroutines The objective view: what makes them useful? Versus explicit state machines Versus conventional threads The subjective view: why do I like them so much? “Teach the student when the student is ready” They s
19_3.eps
The Haskell School of Music — From Signals to Symphonies — Paul Hudak Yale University Department of Computer Science Version 2.4 (February 22, 2012) i The Haskell School of Music — From Signals to Symphonies — Paul Hudak Yale University Department of Computer Science New Haven, CT, USA Version 2.4 (February 22, 2012) Copyright c � Paul Hudak January 2011 All rights reserved. No part of this public
Java Interview Questions
Java remains one of the most common and popular programming languages in the world because of its strong features. Therefore, it’s no surprise that good Java programmers are very much sought after by almost all organizations across the world – be it startups or large multinational corporations. Considering the above, we created a list of common job interview questions about Java programming with d
Clojure's deadly sin
This article is about laziness in Clojure. It is intended to be a comprehensive and objective (however possible) critique of lazy sequences as a feature. In no way do I want this to be a judgment of the decision to make Clojure lazy. Clojure the language is by no means formulaic; creating it involved making a plethora of impactful choices. We can judge by Clojure's longevity that the total package
In Data Science, we primarily use Python as a programming language to perform operations on the available datasets. This article will discuss concepts and details for using Pythons to simplify data operations in data science. Pros and Cons of Python for Data OperationsEven though the pros outweigh the cons, it is crucial to look at both aspects. So, let’s have a look at the advantages and limitati
iOS Interview Questions
Here is a list of common iOS interview questions with detailed answers to help you prepare for the interview as an iOS app developer. As the mobile industry continues to evolve at a rapid pace, so do the expectations for iOS developers in job interviews. These interviews test candidates on a wide array of topics, from the fundamentals of Swift and Objective-C, to the intricacies of the iOS SDK, UI
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
例外を初めて実装した言語 - from scratch
Stop saying Rust is Complicated
Go言語の例外処理がないってのは結局どういうこと？ - Qiita
Prototyping in Rust | corrode Rust Consulting
Announcing TypeScript 5.2 - TypeScript
Agentultra - Using Haskell in Production
Announcing TypeScript 5.2 RC - TypeScript
Amazon CognitoのIDトークンを利用したREST APIの認証例 | Fintan
The Koka programming language
0.10.0 Release Notes ⚡ The Zig Programming Language
JEP 425: Virtual Threads (Preview)
Frozen String Literals: Past, Present, Future?
Announcing TypeScript 5.2 Beta - TypeScript
(翻訳) Kotlinでの型付きエラー処理 - /var/log/jsoizo
When Is WebAssembly Going to Get DOM Support? - ACM Queue
What's New in Emacs 28.1?
Dynamic Exception Reporting in Haskell
April 2021 (version 1.56)
Java Best Practices | The IntelliJ IDEA Blog
Temporal Python SDK | Durable Asyncio Event Loop
定義する例外を減らしつつソフトウェアを設計する方法を"A Philosophy of Software Design"から学ぶ
Android: Interview Questions and Answers
Unwind considered harmful? · baby steps
Philosophy of coroutines
Using Python to Simplify Data Operations in Data Science