3 ms·

I'm not sure what you mean by "syntactically a mess" but Racket provides `mlist` which sounds like exactly what you want [1]. [1] http://docs.racket-lang.org/c

by samth 12y ago

I'm not sure what you mean by "syntactically a mess" but Racket provides `mlist` which sounds like exactly what you want [1]. [1] http://docs.racket-lang.org/compatibility/mlists.html http://docs.racket-lang.org/compatibility/mlists.html

brudgers 12y ago
Thanks. It's not linked from the Racket Reference. Clicking on "mutable lists" in 4.10 is a 'did you mean recursion?' experience. http://docs.racket-lang.org/reference/mpairs.html?q=mcons#%28tech._mutable._list%29 http://docs.racket-lang.org/reference/mpairs.html?q=mcons#%2... That it takes an intimacy with the code base of a regular repo contributor to find it suggests how deeply buried 'mlist is.Or to put it another way, Racket the language does not provide 'mlist. Racket the ecosystem does but deliberately makes it hard to use (by obfuscation) on the moral ground that mutating a list ought incur the pain of iterative 'mcons-ing...and it's associated pretty-print. .
- soegaard 12y ago
  For us that were around when the default changed from mutable to immutable cons cells, known the rule "just prepend an m". I agree that the link in section 4.10 can be improved - but calling it "obfuscation" and "deliberate" is taken it too far. File a bug report, and I bet it will be fixed.
  - brudgers 12y ago
    'mcons is part of 'racket/base. 'mlist is part of a library that contains two layers of warnings, is not linked to by the Racket Guide or Racket reference and lives under the 90th of 96 links on the Documentation page. It's lower in the great chain of being than "Unstable May Change without Warning". (cons 1 (cons 2 (cons 3 '()))) is commonly required in the Racket family of languages for purely pedagogical purposes. That it is the only pattern for 'mcons provided by 'racket is a deliberate statement of community values in regard to mutable lists. In regards to filing a bug report, the bug is that there is mention of mutable lists and a hyper-link in the documentation for the Racket Language. Because mutable lists are not part of the language the bug fix is properly removing the reference - at least in so far as maintaining consistency with the rest of the documentation because other libraries are not cross linked from the Guide and Reference. Linking "mutable lists" to 'compatibility/mlist, would just replace one bug with another...unless leaving 'mlist out of 'racket/base was itself a bug. That that is the case, is unlikely.

by samth 12y ago

brudgers 12y ago

Thanks. It's not linked from the Racket Reference. Clicking on "mutable lists" in 4.10 is a 'did you mean recursion?' experience. http://docs.racket-lang.org/reference/mpairs.html?q=mcons#%28tech._mutable._list%29 http://docs.racket-lang.org/reference/mpairs.html?q=mcons#%2... That it takes an intimacy with the code base of a regular repo contributor to find it suggests how deeply buried 'mlist is.Or to put it another way, Racket the language does not provide 'mlist. Racket the ecosystem does but deliberately makes it hard to use (by obfuscation) on the moral ground that mutating a list ought incur the pain of iterative 'mcons-ing...and it's associated pretty-print. .

soegaard 12y ago
For us that were around when the default changed from mutable to immutable cons cells, known the rule "just prepend an m". I agree that the link in section 4.10 can be improved - but calling it "obfuscation" and "deliberate" is taken it too far. File a bug report, and I bet it will be fixed.
- brudgers 12y ago
  'mcons is part of 'racket/base. 'mlist is part of a library that contains two layers of warnings, is not linked to by the Racket Guide or Racket reference and lives under the 90th of 96 links on the Documentation page. It's lower in the great chain of being than "Unstable May Change without Warning". (cons 1 (cons 2 (cons 3 '()))) is commonly required in the Racket family of languages for purely pedagogical purposes. That it is the only pattern for 'mcons provided by 'racket is a deliberate statement of community values in regard to mutable lists. In regards to filing a bug report, the bug is that there is mention of mutable lists and a hyper-link in the documentation for the Racket Language. Because mutable lists are not part of the language the bug fix is properly removing the reference - at least in so far as maintaining consistency with the rest of the documentation because other libraries are not cross linked from the Guide and Reference. Linking "mutable lists" to 'compatibility/mlist, would just replace one bug with another...unless leaving 'mlist out of 'racket/base was itself a bug. That that is the case, is unlikely.