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Node.js

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js package ecosystem, npm, is the largest ecosystem of open source libraries in the world.

Node.js Philosophy

Small core

The Node.js core should be kept as small as possible. The ecosystem of modules living outside the core.

Small modules

Don't Repeat Yourself (DRY)

In Node.js, one of the most evangelized principles is to design small modules, not only in terms of code size, but most importantly in terms of scope.

Small module is also considered to be the following:

  • Easier to understand and use
  • Simpler to test and maintain
  • Perfect to share with the browser

Small surface area

Node.js modules usually have the characteristic of exposing only a minimal set of functionality.

Simplicity and pragmatism

Keep It Simple, Stupid (KISS)

"The design must be simple, both in implementation and interface. It is more important for the implementation to be simple than the interface. Simplicity is the most important consideration in a design." (c) Richard P. Gabriel

Principles from Isaac Z. Schlueter (source)

  • Write modules that do one thing well. Write a new module rather than complicate an old one.
  • Write modules that encourage composition rather than extension.
  • Write modules that handle data Streams, because that is the universal interface.
  • Write modules that are agnostic about the source of their input or the destination of their output.
  • Write modules that solve a problem you know, so you can learn about the ones you don’t.
  • Write modules that are small. Iterate quickly. Refactor ruthlessly. Rewrite bravely.
  • Write modules quickly, to meet your needs, with just a few tests for compliance. Avoid extensive specifications. Add a test for each bug you fix.
  • Write modules for publication, even if you only use them privately. You will appreciate documentation in the future.
  • Working is better than perfect.
  • Focus is better than features.
  • Compatibility is better than purity.
  • Simplicity is better than anything.