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https://github.com/alexknauth/colon-match
match with colon notation, based on discussion with @soegaard at http://lists.racket-lang.org/users/archive/2013-December/060826.html
https://github.com/alexknauth/colon-match
Last synced: about 1 month ago
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match with colon notation, based on discussion with @soegaard at http://lists.racket-lang.org/users/archive/2013-December/060826.html
- Host: GitHub
- URL: https://github.com/alexknauth/colon-match
- Owner: AlexKnauth
- License: mit
- Created: 2014-10-27T01:03:42.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2022-01-07T14:36:38.000Z (almost 3 years ago)
- Last Synced: 2024-10-16T02:55:10.864Z (3 months ago)
- Language: Racket
- Homepage:
- Size: 11.7 KB
- Stars: 2
- Watchers: 4
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
Awesome Lists containing this project
README
colon-match [](https://travis-ci.org/AlexKnauth/colon-match)
===
match with colon notation, based on discussion with @soegaard at http://lists.racket-lang.org/users/archive/2013-December/060826.html
documentation: http://pkg-build.racket-lang.org/doc/colon-match/index.html
The [`:match`](http://docs.racket-lang.org/colon-match/index.html#%28form._%28%28lib._colon-match%2Fmain..rkt%29._~3amatch%29%29) form is like [`match`](http://docs.racket-lang.org/reference/match.html#%28form._%28%28lib._racket%2Fmatch..rkt%29._match%29%29), except that it allowes identifiers with colons in patterns to specify different types of values. The pattern `x:num` matches a number and binds it as `x`, the pattern `v:str` matches a string and binds it as `v`, and so on.
Examples:
```racket
> (require colon-match)
> (:match 1 [n:num n])
1
> (:match 'x [n:num n] [_ #f])
#f
> (:match '(1 2 3) [(list a:num b:num c:num) (+ a b c)])
6
> (:match '(sym "str" 3)
[(list-no-order n:num str:str sym:sym)
(list n str sym)])
'(3 "str" sym)
```