Talk:S-expressions: Difference between revisions
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(→TCL native types: Some of what I was thinking about) |
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: In TCL, "everything is a string" (or list, depending on how you look at it). <code>{a b c}</code> is the same as <code>"a b c"</code>, which will lead to some unfortunate ambiguities. --[[User:Ledrug|Ledrug]] 16:25, 3 November 2011 (UTC) |
: In TCL, "everything is a string" (or list, depending on how you look at it). <code>{a b c}</code> is the same as <code>"a b c"</code>, which will lead to some unfortunate ambiguities. --[[User:Ledrug|Ledrug]] 16:25, 3 November 2011 (UTC) |
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:: ah, yes, that's a problem. actually, i found that the real problem is that a single element list is indistinguishable from the element itself: |
:: ah, yes, that's a problem. actually, i found that the real problem is that a single element list is indistinguishable from the element itself: |
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<blockquote><pre>% puts [list [list [list a]]] |
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a</pre></blockquote> |
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a |
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:: therefore tagging is already needed just to distinguish lists from atoms.--[[User:EMBee|eMBee]] 17:37, 3 November 2011 (UTC) |
:: therefore tagging is already needed just to distinguish lists from atoms.--[[User:EMBee|eMBee]] 17:37, 3 November 2011 (UTC) |
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::: There are dirty ways to distinguish (which I use in the task on JSON) but generally speaking Tcl programmers write their code to not need to ask whether a particular word is a list or terminal; it's not a distinction that they draw. (It's a different attitude.) The "native" representation of the above would be: |
::: There are dirty ways to distinguish (which I use in the task on JSON) but generally speaking Tcl programmers write their code to not need to ask whether a particular word is a list or terminal; it's not a distinction that they draw. (It's a different attitude.) The "native" representation of the above would be: |
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