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CoffeeScript - Programming language

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

#64on PLDB 14Years Old 65kRepos

Try now: Riju · TIO · Replit

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...

Example from Riju:
console.log "Hello, world!"
Example from hello-world:
alert "Hello World"
// 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
# [0-9]+
# [0-9][0-9]*\.[0-9]+([eE][0-9]+)?[fd]?
# 0x[0-9a-fA-F]+
Switch Statements
While Loops
Booleans true false
Regular Expression Syntax Sugar
Strings "
MultiLine Comments ###
### A comment
Print() Debugging console.log
Line Comments #
# A comment
Semantic Indentation
Case Insensitive Identifiers X
Variable Substitution Syntax X

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