This section describes the conventions used here to describe type signatures.
A [T] is an array-like value (only ever used read-only in this API), i.e., one with an integer length and whose indexed properties from 0 to length - 1 are of type T.
A type T? should be read as T | undefined -- that is, an optional value that may be undefined.
#Node.js and the Event Loop
Node.js is a framework for writing server-side JavaScript applications. It is built on top of the V8 JavaScript runtime and uses an event-driven, non-blocking I/O model that makes it perfectly suited for data-intensive real-time applications.
This blog post will describe what non-blocking I/O means and how working with the event loop can help your applications be more efficient.
##The Restaurant
"This [non-blocking I/O] model simplifies access to slow resources in a scalable way that is intuitive to JavaScript programmers and easy to learn for everyone else." - Node Up and Running.
| function getAverageColourAsRGB (img) { | |
| var canvas = document.createElement('canvas'), | |
| context = canvas.getContext && canvas.getContext('2d'), | |
| rgb = {r:102,g:102,b:102}, // Set a base colour as a fallback for non-compliant browsers | |
| pixelInterval = 5, // Rather than inspect every single pixel in the image inspect every 5th pixel | |
| count = 0, | |
| i = -4, | |
| data, length; | |
| // return the base colour for non-compliant browsers |
| // | |
| // Regular Expression for URL validation | |
| // | |
| // Author: Diego Perini | |
| // Created: 2010/12/05 | |
| // Updated: 2018/09/12 | |
| // License: MIT | |
| // | |
| // Copyright (c) 2010-2018 Diego Perini (http://www.iport.it) | |
| // |
| echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc | |
| . ~/.bashrc | |
| mkdir ~/local | |
| mkdir ~/node-latest-install | |
| cd ~/node-latest-install | |
| curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1 | |
| ./configure --prefix=~/local | |
| make install # ok, fine, this step probably takes more than 30 seconds... | |
| curl https://www.npmjs.org/install.sh | sh |
| # The following will allow you to use URLs such as the following: | |
| # | |
| # example.com/anything | |
| # example.com/anything/ | |
| # | |
| # Which will actually serve files such as the following: | |
| # | |
| # example.com/anything.html | |
| # example.com/anything.php | |
| # |