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Beautiful! (I finally made it to the end of the article where you ask about block delimiting...) I think there are two issues, one being that '........' at th

by leif 17y ago

Beautiful! (I finally made it to the end of the article where you ask about block delimiting...) I think there are two issues, one being that '........' at the end of a large nested expression is ugly, the other being that it's hard to find the start and end of a block as it stands. Since you seem to borrow a lot from ruby, why not add {} and/or begin/end as options? I would definitely keep the period syntax around (for short, shallow blocks), rather than replacing it. "aint"? Cute.

jashkenas 17y ago
Yeah, the periods to end block scope are the part of the syntax I'm the least happy with. I couldn't think of anything nicer without resorting to significant whitespace (which I'd like to avoid). I'd rather not add {/}, or begin/end, because it's easy to determine the beginning of the block, it's just closing it that we need a symbol for. In terms of style, you can certainly indent the period on it's own line if you prefer: elements.each(el => $(el).click(event => if el.hidden el.highlight() . .) .) But I'd love to hear more suggestions for alternatives.
- tdavis 17y ago
  Out of curiosity, what makes you want to avoid significant whitespace? I think it solves the issue quite nicely. For what it's worth, I used to think SW was completely absurd. Then I spent a few years actually writing Python and have no desire to ever go back.
  - j_baker 17y ago
    Python's requirement of indentation is somewhat limiting in terms of what the language can do. For instance, that's partly the reason why Python doesn't allow more than a single expression in a lambda.
    - jashkenas 17y ago
      It doesn't? Is there some kind of documentation about it we can look at?
      - DougBTX 17y ago
        Try: http://docs.python.org/dev/3.0/glossary.html#term-lambda http://docs.python.org/dev/3.0/glossary.html#term-lambda Sounds good that you are going to give significant indentation a try.
  - jashkenas 17y ago
    I like to have the flexibility to indent in whatever style the code calls for. That said, looking over the Python docs again, their implementation of significant whitespace is a lot more flexible than I remembered. I didn't realize you could do one-line method definitions, and that the whitespace only kicks in when you write a multi-line block. Here's a question for you. In Python, if you have a couple of nested lambdas with multiline bodies, getting passed into each other as arguments, do you have to write the closing parenthesis on the correctly-indented line on the other side, or can it be tucked against the inner lambda? In a hypothetical significant-whitespace CoffeeScript, I'm thinking of this: elements.each(el => el.click(event => el.show())) Versus this: elements.each(el => el.click(event => el.show() ) ) Is the second form required to make Python-style whitespace work?
    - aaronsw 17y ago
      No.
      - jashkenas 17y ago
        Great. Then let's start a "whitespace" branch, and give it a go. Edit: Alright, got a branch that starts with a little significant whitespace going here: http://github.com/jashkenas/coffee-script/tree/whitespace http://github.com/jashkenas/coffee-script/tree/whitespace It can't handle the first of the two cases mentioned above just yet, but it compiles the second one correctly.
    - scott_s 17y ago
      Python does not have multiline lambdas. But Python only uses significant whitespace when it can't use other demarcations. For example, the following is legal: a = [ 1, 2, 3]
- lucifer 17y ago
  Its quite pleasing; well done! My take on the blocks is that significant whitespace seems to be a natural expression of blocks for your language and fits quite nicely with the aesthetics of the other forms. (The terminal ... choo choo train is not a winning idea.)
- oliverkofoed 17y ago
  I actually think that the period to end blocks syntax is one of the most interesting things about it. It's such a small thing, but i find it quite intriguing.

by leif 17y ago

jashkenas 17y ago

Yeah, the periods to end block scope are the part of the syntax I'm the least happy with. I couldn't think of anything nicer without resorting to significant whitespace (which I'd like to avoid). I'd rather not add {/}, or begin/end, because it's easy to determine the beginning of the block, it's just closing it that we need a symbol for. In terms of style, you can certainly indent the period on it's own line if you prefer: elements.each(el => $(el).click(event => if el.hidden el.highlight() . .) .) But I'd love to hear more suggestions for alternatives.

tdavis 17y ago
Out of curiosity, what makes you want to avoid significant whitespace? I think it solves the issue quite nicely. For what it's worth, I used to think SW was completely absurd. Then I spent a few years actually writing Python and have no desire to ever go back.
- j_baker 17y ago
  Python's requirement of indentation is somewhat limiting in terms of what the language can do. For instance, that's partly the reason why Python doesn't allow more than a single expression in a lambda.
  - jashkenas 17y ago
    It doesn't? Is there some kind of documentation about it we can look at?
    - DougBTX 17y ago
      Try: http://docs.python.org/dev/3.0/glossary.html#term-lambda http://docs.python.org/dev/3.0/glossary.html#term-lambda Sounds good that you are going to give significant indentation a try.
- jashkenas 17y ago
  I like to have the flexibility to indent in whatever style the code calls for. That said, looking over the Python docs again, their implementation of significant whitespace is a lot more flexible than I remembered. I didn't realize you could do one-line method definitions, and that the whitespace only kicks in when you write a multi-line block. Here's a question for you. In Python, if you have a couple of nested lambdas with multiline bodies, getting passed into each other as arguments, do you have to write the closing parenthesis on the correctly-indented line on the other side, or can it be tucked against the inner lambda? In a hypothetical significant-whitespace CoffeeScript, I'm thinking of this: elements.each(el => el.click(event => el.show())) Versus this: elements.each(el => el.click(event => el.show() ) ) Is the second form required to make Python-style whitespace work?
  - aaronsw 17y ago
    No.
    - jashkenas 17y ago
      Great. Then let's start a "whitespace" branch, and give it a go. Edit: Alright, got a branch that starts with a little significant whitespace going here: http://github.com/jashkenas/coffee-script/tree/whitespace http://github.com/jashkenas/coffee-script/tree/whitespace It can't handle the first of the two cases mentioned above just yet, but it compiles the second one correctly.
  - scott_s 17y ago
    Python does not have multiline lambdas. But Python only uses significant whitespace when it can't use other demarcations. For example, the following is legal: a = [ 1, 2, 3]
lucifer 17y ago
Its quite pleasing; well done! My take on the blocks is that significant whitespace seems to be a natural expression of blocks for your language and fits quite nicely with the aesthetics of the other forms. (The terminal ... choo choo train is not a winning idea.)
oliverkofoed 17y ago
I actually think that the period to end blocks syntax is one of the most interesting things about it. It's such a small thing, but i find it quite intriguing.