Re: Clojure Spec and Human Readable Error Messages
Many thanks John. I'll check out phrase. If you do get something working I'd love to see it as your approach seems the simplest to me. cheers Dave On Monday, February 3, 2020 at 10:27:08 PM UTC, John Shaffer wrote: > > The phrase library can create human-readable error messages: > https://github.com/alexanderkiel/phrase > > I've been working on something for a more natural (to me) approach, with > the ability to define error messages in-line with the predicate. E.g., > > (s/defop max-length [n] > (sf/validator >#(>= n (count %)) >(str "Must be " n " characters or less."))) > > I got this working with spec-alpha2, but my plan was to write some reforms > helpers, and I don't think there is any alpha2 support in ClojureScript. It > seems a lot harder to write specs for the shipping version of spec, but > I'll probably give it a shot this weekend. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/87755d5c-b66c-4045-817a-a1fac549f23c%40googlegroups.com.
Clojure Spec and Human Readable Error Messages
Hi All. I've just come back to Clojure (after being away for a few years) and I'm incredibly impressed with how things have moved on. I particuarly like Clojure Spec but I'm struggling to understand how I can convert coercion erros to a human friendly for for end users to understand on a website - i..e user submits a form and gets an error back they can understand. My Google Foo doesn't appear to have helped but I can't believe I'm the only one to find this a problem (or maybe I don't fully understand spec). any help gratefully received. cheers Dave -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/7c6662a8-1ce1-4b26-abd3-4c61a583ed13%40googlegroups.com.
Re: ANN: Reagent 0.3.0 - now with async rendering
Hi Dan First of all thank you for Reagent - I'm enjoying playing with the library. Do you have a simple example of passing child components and then rendering them as I cannot get this to work - I fairly new to Clojure so it could be user error. cheers Dave -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: ANN: Reagent 0.3.0 - now with async rendering
Thanks Dan I'll give this a go. cheers Dave -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Recommendations for parsing/validating a JSON structure
Hi Folks. I'm writing a web app which receives a JSON structure. I'd like to validate that the structure is correct i.e. mandatory fields are present, and then convert into the relevant Clojure data structure. As a bonus if a particular field in the JSON structure is incorrect I'd like to be able to define the error message generated (in a similar way I can do for noir.validation). Does anyone have any recommended libraries or the best way to approach this issue - I'm sure I'm not the first with this requirement. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Recommendations for parsing/validating a JSON structure
Thanks Korny. I'll take a look. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Help with Reduce
Hi I have the following function: (defn group [ validators] (fn [m] (reduce (fn [maps f] (let [[m error-m] maps [new-map errors] (f m)] [new-map (vec (flatten (if errors (conj error-m errors) error-m)))])) [m []] validators ))) The following call (def foo group) returns a function. All as I'd expect. I then thought I'd replace the anonymous function with a named function... (defn validate [maps f] (let [[m error-m] maps [new-map errors] (f m)] [new-map (vec (flatten (if errors (conj error-m errors) error-m)))])) (defn group2 [ validators] (fn [m] (reduce validate [m []] validators ))) The following call (def foo group2) returns an empty vector. I would have though it would have returned a function. Am I missing something? cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Help with Reduce
Hi Guru odd. I'll give it another go. Kind Regards DAve -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Help with Reduce
Hi Guru Ah my mistake, silly typo in my version. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Help with Static Site Generator
Hi has anyone used Static (https://github.com/nakkaya/static) to create a site. The documentation is a little sparse and I'm struggling to set up my default.clj file. If someone has a version I could copy that would be great. many thanks Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Help with Static Site Generator
Perfect - many thanks. -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would I do this in Clojure?
Hi Folks firstly a big thank you for all the help so far. I posted the original question because I've been looking at Midje which has the ability to stub out a function but have the stub function return different data each time it is called (it also counts the number of times the stubbed out function is called). Still being a Clojure newbie (and having heard that the Midje codebase is complex) I thought I'd ask how this could be done. I know about with-redefs so figured out how to stub a function but was struggling with calling something that returned a set of values. So basically this is a learning exercise for me. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
How would I do this in Clojure?
Hi I'd like to be able to define a function that is passed a vector of items and returns a function such that each time the returned function is called it returns the next item in my-vector. For example (def blah (my-function [1 2 3]) (blah) = 1 (blah) = 2 (blah) = 3 Is this possible? cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would I do this in Clojure?
Guru and Kelker thanks for such prompt replies. I'll give both a try. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would I do this in Clojure?
Hi Puzzler I like the first approach you defined and it works perfectly thank you. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Red Tape Form Validation - a style question
Hi Folks I've been looking at the red-tape form validation library and really like it (especially coming from a Django background). The one thing that makes me nervous is that the when validating data it uses exceptions if the data is invalid. I'd read somewhere that you should only use exceptions for error conditions you can't predict - I'd have thought that form validation was an example of where you'd expect there to be errors and hence handle them. My question is: Do people think that the use of exceptions in this way is a reasonable approach? BTW I think the library is great and the documentation first class so I'm in no way criticizing the author. Cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Breaking out of a map type function
Hi All. Still struggling to get my head around Clojure - this is attempt number 4. I wish to process each item in a vector. I know I can use map to do this e.g. (map my-func my-vector). My problem is that I need to be able to break out of the map if my-func returns an error when processing any of the items. I know map isn't what I'm looking for but is there a function or some idiomatic piece of clojure to achieve my aim. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Breaking out of a map type function
Hi Stu I understand Reduce but can't quite see how this would work. Don't suppose you'd have a simple example would you? Many thanks Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Breaking out of a map type function
@James - I'll take a look at take-while @Michael - I thought using exceptions to break out of a stuff was considered bad practice? cheers Davew -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Breaking out of a map type function
Many thanks James -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Breaking out of a map type function
Jernau - that looks perfect. I'll give it a go. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Hi Ryan
I'm really impressed with Caribou but would make one request that will make
my life easier. I'm a big fan of Angular JS and the template tags for
Angular and Caribou clash. Is there any chance these could be changed from
{{ to {% (or something similar)?
The best result for me would be the standard template tags get changed in
Caribou but a compromise would be the ability to change the tags on a per
page basis.
cheers
Dave
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Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Hi Khalid yes I'm aware you can change the template tags (and the pitfalls :-)). I thought it would be easier to see if we could avoid this problem all together by using a different set of tags (especially as Caribou is Alpha release and hopefully open to change). BTW I don't intend to miss Angular and Caribou templates tags in the same page, I just want to be able to use the Caribous admin etc AND have my own pages use Angular. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Ryan - that is great news. Are we allowed to know what else will be release :-). cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Hi Ryan If I create a model Customer - will Caribou create a specific table Customer. I ask because using H2 Console I can't find any of the tables I'd have expected to find having created my model. (This may be user error as I'm not used to using H2). cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Hi Ryan I'm probably doing something daft but I'm using H2 Console and connecting to taiga_development.h2.db (user: sa). running select * from wibble (the name of my model) returns table wibble not found. I can create instances of wibble via the Admin UI. Like I've said I'm pretty sure this is user error but any pointers as to what I'm doing wrong would be really helpful. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Hi Ryan please ignore my previous email - it was definitely a user error - looking at the wrong database (doh!). Look forward to getting to grips with the framework over the next few days. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Hi Ryan Congratulations on the release of Caribou. I've got a couple of questions. 1. If I create a model via the Admin UI, am I right in thinking that this does not actually create a clj file containing the details of the model which I could edit later via a text editor? 2. Do you the concept of model validations so that a field must be numeric and between 10 and 50? many thanks for you help. Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Releasing Caribou today: Open Source Clojure Web Ecosystem
Ryan thanks for the great reply. I'll have to play a bit more to really get my head around this. I'd too would love to see a simple blog example not using the Admin interface to try and show how and where you'd define your models. many thanks. Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure special forms
Hi All thank you for your answers. I think I now understand (@Gregory - completely agree about Clojure being pragmatic). Onwards and Upwards Kind Regards Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure special forms
Thanks Christophe. Love the book BTW. cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Clojure special forms
Hi I am just setting out to learn Clojure (my 2nd attempt) and am starting to feel more comfortable with the language (and very excited about the possibilities). However, I'm reading Clojure Programming (Emerick, Carper and Grand) and read that Special forms are the primitive building blocks on which the rest of the language is built. I therefore thought that every function defined in Clojure.core would be defined in terms of the specials forms in some way. So I looked at the source for reduce to see that it actually makes a call to java . reduce. This would imply that the special forms are not quite what I understood. Am I right in thinking that certain Lisps do indeed define all of their higher level functions in terms of a very small subset of special forms or have I completely misunderstood. Kind Regards Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Clojure special forms
Hi Both. Thank you for your prompt replies. Maybe I'm being purist but if one of the special forms is the dot you have all of Java to play with so presumably you could produce any of the other clojure functions. I thought that the special forms enabled you to produce all other elements of the language with just the special forms. Isn't having the dot cheating a bit :-). cheers Dave -- -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Help with #'
Hi Stuart
fantastic - it is starting to make sense now. One follow on question.
Presumably this only applies to functions? If I replace (defn foo []
hello) with (def foo hello) I don't get the same results. Is this
because functions are handled differently?
many thanks (again)
Dave
On Apr 23, 2:48 am, Stuart Campbell stu...@harto.org wrote:
Hi Dave,
If you write
(run-jetty routes ...)
then the current value of routes is looked-up and passed to run-jetty.
You won't see any change if you subsequently redefine routes, because the
original definition is what was passed to run-jetty.
On the other hand,
(run-jetty #'routes ...)
passes a var (seehttp://clojure.org/vars) to run-jetty. Now whenever
run-jetty invokes your handler function, the currently-bound value of
routes is invoked.
Here's a simplified example:
user (defn foo [] hello)
#'user/foo
user (def a foo)
#'user/a
user (def b #'foo)
#'user/b
user (defn foo [] goodbye)
#'user/foo
user (a)
hello
user (b)
goodbye
Cheers,
Stuart
On 23 April 2012 06:01, David Simmons shortlypor...@gmail.com wrote:
Hi
I'm new to Clojure but very keen to learn. I'm following Web
Development with Clojure (http://www.vijaykiran.com/2012/01/11/web-
application-development-with-clojure-part-1/) and came across the
following code:
(run-jetty #'routes {:port (or port 8080) :join? false}))
I know that #'routes is the same as (var routes) and that it is
passing the object rather than the actual value BUT I don't
understand why this is used. Specifically if I replace #'route with
route the code works fine. I've read somewhere this is something to do
with autoloading changes to code when developing for the web. Does
anyone have a simple explanaition for #' and why it is used here. If
you have some simple clojure code to illustrate its use I'd be really
grateful.
many thanks in advance for any help.
Dave
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Re: Help with #'
Hi Tassilo Perfect answer - the fog is definately beginning to lift! Do you know why Clojure automatically dereferences functions but not for other bound values? cheers Dave On Apr 23, 1:36 pm, Tassilo Horn tass...@member.fsf.org wrote: David Simmons shortlypor...@gmail.com writes: Hi David, Presumably this only applies to functions? No, not really. If I replace (defn foo [] hello) with (def foo hello) I don't get the same results. Is this because functions are handled differently? --8---cut here---start-8--- user (def foo hello) #'user/foo user (def a foo) ;; a has the current value of foo #'user/a user (def b #'foo) ;; b's value is the Var foo #'user/b user (def foo goodbye) #'user/foo user a hello user b #'user/foo user @b goodbye --8---cut here---end---8--- Please note that you have to dereference b explicitly to get the value currently bound to foo. That's because b's value is again a Var. It seems that Clojure dereferences Var's automatically, possibly multiple times, in case of function calls. So in Stuard's example, both (b) and (@b) call the function currently bound to foo. Bye, Tassilo -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Help with #'
Cedric - apologies - fat fingers on my mobile phone!! To both Cedric and Meikel - thank you both for your help. I'm finding Clojure a great language to learn (if a little difficult at first). It seems a much more consistent language than the others I have studied which I think is fantastic. Dave On Apr 23, 7:36 pm, Cedric Greevey cgree...@gmail.com wrote: On Mon, Apr 23, 2012 at 2:32 PM, shortlypor...@googlemail.com shortlypor...@gmail.com wrote: [in reply to my confirmation that vars referencing vars referencing functions are still callable as functions] Sent from my HTC Beg pardon? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Help with #'
Hi
I'm new to Clojure but very keen to learn. I'm following Web
Development with Clojure (http://www.vijaykiran.com/2012/01/11/web-
application-development-with-clojure-part-1/) and came across the
following code:
(run-jetty #'routes {:port (or port 8080) :join? false}))
I know that #'routes is the same as (var routes) and that it is
passing the object rather than the actual value BUT I don't
understand why this is used. Specifically if I replace #'route with
route the code works fine. I've read somewhere this is something to do
with autoloading changes to code when developing for the web. Does
anyone have a simple explanaition for #' and why it is used here. If
you have some simple clojure code to illustrate its use I'd be really
grateful.
many thanks in advance for any help.
Dave
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