CoffeeScript - Programming language

CoffeeScript is an open source programming language created in 2009 by Jeremy Ashkenas.

#47on PLDB

15Years Old

65kRepos

CoffeeScript is a programming language that transcompiles to JavaScript. It adds syntactic sugar inspired by Ruby, Python and Haskell in an effort to enhance JavaScript's brevity and readability. Specific additional features include list comprehension and pattern matching. Read more on Wikipedia...

CoffeeScript website
CoffeeScript Wikipedia page
PLDB has 2 documentation sites for CoffeeScript: coffeescript.org, devdocs.io
There are at least 64,590 CoffeeScript repos on GitHub
CoffeeScript first developed in https://github.com/jashkenas
CoffeeScript compiles to JavaScript
The Google BigQuery Public Dataset GitHub snapshot shows 45k users using CoffeeScript in 69k repos on GitHub
Explore CoffeeScript snippets on Rosetta Code
CoffeeScript appears in the TIOBE Index
CoffeeScript Ubuntu package
CodeMirror package for syntax highlighting CoffeeScript
Monaco package for syntax highlighting CoffeeScript
Pygments supports syntax highlighting for CoffeeScript
GitHub supports syntax highlighting for CoffeeScript
CoffeeScript appears in the Quine Relay project
There is 1 Jupyter Kernel for CoffeeScript
Frequently Asked Questions for CoffeeScript
coffeescript.org was registered in 2009
See also: (17 related languages)Haskell, JavaScript, Perl, Python, Ruby, YAML, LiveScript, Ruby on Rails, JQuery, Apache Maven, Java, Markdown, Elm, Haxe, Dart, Opa, TypeScript

Example from Riju:

console.log "Hello, world!"

Example from hello-world:

alert "Hello World"

Example from the Hello World Collection:

// Hello world in CoffeeScript

alert "Hello, World!"

Example from Linguist:

console.log "Hello, World!"

Example from Wikipedia:

author = "Wittgenstein"
quote  = "A picture is a fact. -- #{ author }"

sentence = "#{ 22 / 7 } is a decent approximation of π"

CoffeeScript Keywords

and or is isnt not on yes @ no off true false null this new delete typeof in instanceof return throw break continue debugger if else switch for while do try catch finally class extends super undefined then unless until loop of by when

Language features

Feature	Supported	Token	Example
Integers	✓		# [0-9]+
Floats	✓		# [0-9][0-9]*\.[0-9]+([eE][0-9]+)?[fd]?
Hexadecimals	✓		# 0x[0-9a-fA-F]+
Conditionals	✓
Inheritance	✓
Switch Statements	✓
Exceptions	✓
Classes	✓
While Loops	✓
Booleans	✓	true false
Regular Expression Syntax Sugar	✓
Strings	✓	"
MultiLine Comments	✓	###	### A comment ###
Print() Debugging	✓	console.log
Line Comments	✓	#	# A comment
Semantic Indentation	✓
Comments	✓
Case Insensitive Identifiers	X
Variable Substitution Syntax	X