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Questions tagged [coffeescript]

A language that transpiles to JavaScript. Use this tag for questions about programming with the CoffeeScript language.

From the CoffeeScript Homepage:

CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way.

CoffeeScript can be used in any JavaScript environment. Included in a web page, it supports <script type="text/coffeescript"> tags; with node.js it can compile code on the command line, and it is also available as a Ruby gem.

The documentation and downloads can be found on the CoffeeScript website.

Common causes of unexpected behavior

  • Check your whitespace. Indentation is SIGNIFICANT. Mixing SPACE and TAB in indentation will create problems. Make sure you understand the rules for whitespace and make sure you triple-check this.

Popular questions

###Freely available CoffeeScript programming books

Video Tutorial

Codeschool CoffeeScript Tutorial - Awesome place to start with CoffeeScript.

9747 questions
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React input defaultValue doesn't update with state

I'm trying to create a simple form with react, but facing difficulty having the data properly bind to the defaultValue of the form. The behavior I'm looking for is this: When I open my page, the Text input field should be filled in with the text of…
Neeharika Bhartiya
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Is there any way to not return something using CoffeeScript?

It seems like CoffeeScript automatically returns the last item in a scope. Can I avoid this functionality?
Shamoon
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CoffeeScript on Windows?

How can I try CoffeeScript on Windows? The installation instructions are only for *nix: http://jashkenas.github.com/coffee-script/#installation EDIT: Since I asked this a while ago, many new answers have appeared. The number ( and quality ) of…
Nick Perkins
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What does "Splats" mean in the CoffeeScript tutorial?

Looking at this CoffeeScript tutorial : http://jashkenas.github.com/coffee-script/ I don't quite see what the Splats is for. What is this construction? Where does it come from (historically)
interstar
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React onClick and preventDefault() link refresh/redirect?

I'm rendering a link with react: render: -> `upvote` Then, above I have the upvote function: upvote: -> // do stuff (ajax) Before link I had span in that place but I need to switch to link and…
Wordpressor
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Simplest way to check if key exists in object using CoffeeScript

In CoffeeScript, what is the simplest way to check if a key exists in an object?
ajsie
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Defining an array of anonymous objects in CoffeeScript

How do I define an array of anonymous objects in CoffeeScript? Is this possible at all, using the YAML syntax? I know that having an array of named objects is quite easy: items:[ item1: name1:value1 item2: name:value2 ] However,…
Preslav Rachev
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In CoffeeScript how do you append a value to an Array?

What is the prescribed way to append a value to an Array in CoffeeScript? I've checked the PragProg CoffeeScript book but it only discusses creating, slicing and splicing, and iterating, but not appending.
Dave Sag
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How can I manage client-side JavaScript dependencies?

Although there are great solutions to manage dependencies on the server side, I could not find any that satisfies all my needs to have a coherent client side JavaScript dependency management workflow. I want to satisfy these five…
pathikrit
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Has anyone used Coffeescript for a production application?

Coffeescript looks pretty cool. Has anyone used it? What are its Pros & Cons?
Esteban Araya
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Easiest way to check if string is null or empty

I've got this code that checks for the empty or null string. It's working in testing. eitherStringEmpty= (email, password) -> emailEmpty = not email? or email is '' passwordEmpty = not password? or password is '' eitherEmpty = emailEmpty ||…
jcollum
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CoffeeScript Undefined

In javascript to check if a variable was never created, we just do if (typeof MyVariable !== "undefined"){ ... } I was wonder how I do that in coffeescript?... I try something like if (MyVariable?false){ ... } but this check if MyVariable is a…
Jaider
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Environment detection: node.js or browser

I'm developping a JS-app that needs to work both on the client side and the server side (in Javascript on a browser and in Node.js), and I would like to be able to reuse the parts of the code that are used for both sides. I have found out that…
edi9999
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Coffeescript --- How to create a self-initiating anonymous function?

How to write this in coffeescript? f = (function(){ // something })(); Thanks for any tips :)
user537339
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How do I get the Back Button to work with an AngularJS ui-router state machine?

I have implemented an angularjs single page application using ui-router. Originally I identified each state using a distinct url however this made for unfriendly, GUID packed urls. So I have now defined my site as a much simpler state-machine. The…
biofractal
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