It's much more diff between frontend and backend.

• [Common] Type judgment
• [Common] Scope
• [Common] Reference
• [Common] Memory release
• [Common] ES6+ features

Common Problem

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• [Common] Module
• [Common] Hotfix
• [Common] Context
• [Common] Package Manager

Common Problem

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• [Common] Promise
• [Doc] Events
• [Doc] Timers
• [Bonus] Blocking & Non-blocking
• [Bonus] Parallel & Concurrent

Common Problem

• What's the difference between the Promise's second argument of '.then' function and '.catch' function? [more]
• Is the Eventemitter.emit synchronous or asynchronous? [more]
• How to judge whether a interface is asynchronous? Is it asynchronous while a callback provided? [more]
• Diff among nextTick, setTimeout and setImmediate? [more]
• How to implement a Sleep function? [more]
• How to implement an async.reduce? [more]

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• [Doc] Process
• [Doc] Child Processes
• [Doc] Cluster
• [Bonus] IPC
• [Bonus] Daemon

Common Problem

• What's the current working directory of the process? What's it for? [more]
• Difference between child_process.fork and fork in POSIX? [more]
• Does the death of parent process or child process affect each other? What is an orphan process? [more]
• How does the cluster load balance work? [more]
• What's daemon process? how to implement? [more]

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• [Doc] Buffer
• [Doc] String Decoder
• [Doc] Stream
• [Doc] Console
• [Doc] File System
• [Doc] Readline
• [Doc] REPL

Common Problem

• What does Buffer for? Can we change the buffer's size? [more]
• What's the highWaterMark & drain event of Stream? What's their relation? [more]
• What's Stream.pipe for? Is it make copy or pass object while piping? [more]
• What is stdio, stdout, stderr and file descriptor? [more]
• Is console.log asynchronous? How to implement console.log? [more]
• How to get user input synchronously? [more]
• How to implement 'Readline'? [more]

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• [Doc] Net
• [Doc] UDP/Datagram
• [Doc] HTTP
• [Doc] DNS
• [Doc] ZLIB
• [Common] RPC

Common Problem

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• [Doc] TTY
• [Doc] OS
• [Doc] Command Line Options
• [Common] Load
• [Bonus] CheckList
• [Common] Indicators

Common Problem

• What's TTY? How to check if terminal is TTY? [more]
• Is there different among operating system's EOL(end of line)? [more]
• What is system load? how to check it? [more]
• What's ulimit for? [more]

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• [Doc] Errors
• [Doc] Domain
• [Doc] Debugger
• [Doc] C/C++ Addon
• [Doc] V8
• [Bonus] Memory snapshot
• [Bonus] CPU Profilling

Common Problem

• How to handle unexpected errors? With try/catch, domains or something eles? [more]
• What is uncaughtException event? when shoud we use it? [more]
• What is domain's principle? why domain is deprecated? [more]
• What's defensive programming? how about 'let it crash'?
• Why we need error-first callback? why there are callback not error-first, such as http.createServer?
• Why there are errors can't location? how to locate accurately? [more]
• What cause memory leak? how to locate and analyse it? [more]

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• [Common] Methods
• [Common] Unit Test
• [Common] Benchmarks
• [Common] Integration Test
• [Common] Pressure Test
• [Doc] Assert

Common Problem

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• [Doc] URL
• [Doc] Query Strings
• [Doc] Utilities
• [Common] Regex

Common Problem

• How does HTTP pass let arr = [1,2,3,4] to the server by GET method? [more]
• How to implement util.inherits in Node.js? [more]
• How do I get all the file names under a folder? [more]

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• [Common] Sql
• [Common] NoSql
• [Bonus] Cache
• [Bonus] Consistency

Common Problem

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• [Doc] Crypto
• [Doc] TLS/SSL
• [Doc] HTTPS
• [Bonus] XSS
• [Bonus] CSRF
• [Bonus] MITM
• [Bonus] Sql/Nosql Injection

Common Problem

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Current repo is translating, you can report on issues freely if there is typo or reading problem.