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DoorDash Uses Envoy and Valkey for a 1.5M RPS Proxy Cache with 99.99999% Availability

DoorDash has developed Entity Cache, a transparent proxy caching platform built on Envoy and Valkey to reduce redundant service-to-service requests across its microservices architecture. Operating within DoorDash’s service mesh, the platform serves over 1.5M requests per second with 99.99999% availability through caching, event-driven invalidation, failure handling, and performance optimizations. By Leela Kumili

2026-07-20 原文 →
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Electric air taxis go to war

Electric aviation is still in its infancy, but manufacturers are already looking beyond mere air taxi trips across cities. Today, one of the leading air taxi startups, San Jose-based Archer Aviation, unveiled a new aircraft it co-developed with defense technology company Anduril - though the platform is designed for both military and commercial uses, the […]

2026-07-20 原文 →
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Avengers: Doomsday’s first trailer puts everyone on high alert

After months of teasing us with reminders about how large Avengers: Doomsday's cast is going to be, Marvel has finally released a proper trailer for the film. Though Robert. Downey Jr.'s Doctor Doom definitely appears to be causing a lot of the chaos in Doomsday's first trailer, the movie seems like it's going to feature […]

2026-07-20 原文 →
开源项目

🔥 huangxd- / danmu_api - 一个人人都能部署的基于 js 的弹幕 API 服务器,支持爱优腾芒哔咪人韩巴狐乐西埋帆弹幕直接获取,兼容弹弹play的搜

GitHub热门项目 | 一个人人都能部署的基于 js 的弹幕 API 服务器,支持爱优腾芒哔咪人韩巴狐乐西埋帆弹幕直接获取,兼容弹弹play的搜索、详情查询和弹幕获取接口规范,并提供日志记录,支持vercel/netlify/edgeone/cloudflare/docker/hf等部署方式,不用提前下载弹幕,没有nas或小鸡也能一键部署。 | Stars: 2,789 | 13 stars today | 语言: JavaScript

2026-07-20 原文 →
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Understanding Callback Functions in JavaScript

Introduction A callback function is one of the most important concepts in JavaScript. It allows one function to execute another function after completing a task. Callback functions are widely used in JavaScript for handling asynchronous operations such as API requests, file reading, event handling, and timers. What is a Callback Function? A callback function is a function that is passed as an argument to another function and is executed later. In simple words: A callback is a function that is called after another function finishes its work. Syntax function greeting () { console . log ( " Good Morning! " ); } function welcome ( callback ) { console . log ( " Welcome! " ); callback (); } welcome ( greeting ); Output Welcome! Good Morning! Explanation greeting() is the callback function. welcome() accepts a function as a parameter. callback() executes the greeting function after printing "Welcome!". Real-Life Example Imagine you order food at a restaurant. You place the order. The chef prepares the food. After the food is ready, the waiter serves it. Here, serving the food happens only after preparation is complete. This is exactly how callback functions work. Example 1: Email Sending function emailSent () { console . log ( " Email Sent Successfully! " ); } function sendEmail ( callback ) { console . log ( " Sending Email... " ); callback (); } sendEmail ( emailSent ); Output Sending Email... Email Sent Successfully! Example 2: Download File function downloadComplete () { console . log ( " Download Complete! " ); } function downloadFile ( callback ) { console . log ( " Downloading File... " ); callback (); } downloadFile ( downloadComplete ); Output Downloading File... Download Complete! Why Do We Use Callback Functions? Callback functions are useful because they: Execute code only after another task finishes. Improve code reusability. Handle asynchronous operations. Make event handling easier. Help avoid repeating code. Where Are Callback Functions Used? Some common u

2026-07-20 原文 →