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Intro

  • JavaScript runtime environment
  • Single-threaded, event-driven non-blocking I/O

Usages

  • Scalable web servers
  • Command-line utilities
  • Front-end web development build tools
  • Cross-platform desktop apps e.g. Atom
  • Web browser applications of the future

Excels at

  • I/O
  • Streaming
  • Real-time
  • JSON APIs

Not so good at

  • Computation

Interactive portion

  • Hello world
    • Create simple http server
    • Launch it via cmd

Asynchrony

  • JavaScript uses an "event loop" to do deferred processing
  • Why bother with this confusing paradigm?
  • Blocking vs non-blocking I/O

Libraries

I choose a lazy person to do a hard job. Because a lazy person will find an easy way to do it.

  • The easy way is libraries
  • Java, Python... large standard libraries
  • JavaScript... basically nothing

NPM

  • Package (library) manager for Node
  • Nearly 200,000 software packages
  • npmjs.com
  • Recursive dependency structure
  • See packaging/