How to Write CoffeeScript Efficiently

Posted by wyclif on Tuesday November 29, 2011 @05:46AM
from the esa-matti.suuronen.org dept.

http://esa-matti.suuronen.org/blog/2011/11/28/how-to-write-coffeescript-efficiently/

( 10 comments | 48 points | on HN )

Re:How to Write CoffeeScript Efficiently by skrebbel on Tuesday November 29, 2011 @08:46AM (#3290240)

Should have been renamed to "Some Vim tricks for CoffeeScript writing".

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Re:How to Write CoffeeScript Efficiently by nilbus on Tuesday November 29, 2011 @08:25AM (#3290177)

Could someone explain how {@foo} = bar compiles into this.foo = bar.foo;?

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Re:How to Write CoffeeScript Efficiently by yesbabyyes on Tuesday November 29, 2011 @08:41AM (#3290230)

"@" is an alias for "this.", so "@foo" is the same as "this.foo".

{foo} = bar is using destructuring assignment, it means, take property "foo" of bar and put it in variable foo, so

    {foo} = bar

compiles to

    var foo = bar.foo;

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Re:How to Write CoffeeScript Efficiently by nilbus on Tuesday November 29, 2011 @08:57AM (#3290270)

Thanks! It was the destructuring part that I wasn't understanding right away.

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Re:How to Write CoffeeScript Efficiently by yesbabyyes on Tuesday November 29, 2011 @10:18AM (#3290607)

No problem! CoffeeScript's destructuring is really nice, IMO:

    [first, rest..., last] = someArray

    professions =
      programmer:
        studyTime: "5 years"
        salary: 10000
      salesman:
        studyTime: "2 years"
        salary: 15000
    
    {programmer: {salary}} = professions
    
    console.log "A programmer's salary is %s", salary

EDIT: Fixed bug, "developer" should be "programmer".

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Re:How to Write CoffeeScript Efficiently by jrnkntl on Tuesday November 29, 2011 @10:31AM (#3290682)

   {developer: {salary}} = professions

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Re:How to Write CoffeeScript Efficiently by s00pcan on Tuesday November 29, 2011 @08:50AM (#3290250)

I followed the link to the Syntastic plugin and can't get it to work. The version on github doesn't have the SyntasticEnable function for some reason, so I used the package on vim.org. I added the statusline changes and SyntaxEnable php to my vimrc, still does absolutely nothing. I'm not seeing anything different on my statusline when saving files and the :Errors function doesn't show anything either. Ideas?

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Re:How to Write CoffeeScript Efficiently by diploid on Tuesday November 29, 2011 @01:50PM (#3291602)

Manually compiling your CoffeeScripts just seems archaic. Is there no equivalent to Sinatra AssetPack for node.js?

Frankly, this is not an efficient workflow for CoffeeScript.

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Re:How to Write CoffeeScript Efficiently by Epeli on Wednesday November 30, 2011 @06:58AM (#3294745)

Try http://epeli.github.com/piler/

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Re:How to Write CoffeeScript Efficiently by VMG on Tuesday November 29, 2011 @08:58AM (#3290279)

sadly, this could also be called "why it is difficult to write CoffeScript efficiently without some vim plugins"

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