when function
Hi all, I'm struggling with when code structures and my imperative mindset. What is the better approach (or functional approach) to work with a code like the below? (defn parse-group [group-identifier line] (when (= group-identifier ID1) (handle-id1 line)) (when (= group-identifier ID2) (handle-id2 line)) (when (= group-identifier ID3) (handle-id3 line))) Thank you. -- christian -- 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: when function
On May 21, 2012, at 10:54 AM, Christian Guimaraes wrote: I'm struggling with when code structures and my imperative mindset. What is the better approach (or functional approach) to work with a code like the below? I think you're looking for cond (from memory, syntax might be wrong): (defn parse-group [group-identifier line] (cond (= group-identitifer ID1) (handle-id1 line) ... :else (do-something))) etc (doc cond) will give you what you need I think bill (defn parse-group [group-identifier line] (when (= group-identifier ID1) (handle-id1 line)) (when (= group-identifier ID2) (handle-id2 line)) (when (= group-identifier ID3) (handle-id3 line))) -- 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: when function
In this case I prefer either: (cond (= group-identifier ID1) (handle-id1 line) (= group-identifier ID2) (handle-id2 line) (= group-identifier ID3) (handle-id3 line)) Or just use core.match: (match [group-identifier] [ID1] (handle-id1 line) [ID2] (handle-id1 line) [ID3] (handle-id1 line)) But then again, I have this thing for pattern matching...it's so elegant. Timothy Baldridge On Mon, May 21, 2012 at 10:54 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hi all, I'm struggling with when code structures and my imperative mindset. What is the better approach (or functional approach) to work with a code like the below? (defn parse-group [group-identifier line] (when (= group-identifier ID1) (handle-id1 line)) (when (= group-identifier ID2) (handle-id2 line)) (when (= group-identifier ID3) (handle-id3 line))) Thank you. -- christian -- 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 -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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: when function
I'm surprised no one went for condp (defn parse-group [group-identifier line] (condp = group-identifier ID1 (handle-id1 line) ID2 (handle-id2 line) ID3 (handle-id3 line) (handle-unknown-id line))) or something like that... On Mon, May 21, 2012 at 11:59 AM, Timothy Baldridge tbaldri...@gmail.comwrote: In this case I prefer either: (cond (= group-identifier ID1) (handle-id1 line) (= group-identifier ID2) (handle-id2 line) (= group-identifier ID3) (handle-id3 line)) Or just use core.match: (match [group-identifier] [ID1] (handle-id1 line) [ID2] (handle-id1 line) [ID3] (handle-id1 line)) But then again, I have this thing for pattern matching...it's so elegant. Timothy Baldridge On Mon, May 21, 2012 at 10:54 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hi all, I'm struggling with when code structures and my imperative mindset. What is the better approach (or functional approach) to work with a code like the below? (defn parse-group [group-identifier line] (when (= group-identifier ID1) (handle-id1 line)) (when (= group-identifier ID2) (handle-id2 line)) (when (= group-identifier ID3) (handle-id3 line))) Thank you. -- christian -- 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 -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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 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: when function
On Mon, May 21, 2012 at 8:54 AM, Christian Guimaraes
cguimaraes...@gmail.com wrote:
What is the better approach (or functional approach) to work with a code
like the below?
A simple translation to condp:
(defn parse-group [group-identifier line]
(condp = group-identifier
ID1 (handle-id1 line)
ID2 (handle-id2 line)
ID3 (handle-id3 line)))
But you may want something more extensible:
(def group-handlers
{ID1 handle-id1,
ID2 handle-id2,
ID3 handle-id3})
(defn parse-group [group-identifier line]
(if-let [handler (group-handlers group-identifier)]
(handler line)
(println unknown group identifier)))
A multimethod might also be an appropriate way forward for you.
--
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Re: when function
On Monday, May 21, 2012 6:54:28 PM UTC+3, Christian Guimaraes wrote:
Hi all,
I'm struggling with when code structures and my imperative mindset.
What is the better approach (or functional approach) to work with a code
like the below?
(defn parse-group [group-identifier line]
(when (= group-identifier ID1)
(handle-id1 line))
(when (= group-identifier ID2)
(handle-id2 line))
(when (= group-identifier ID3)
(handle-id3 line)))
Thank you.
-- christian
Hi
Maybe something like
(defn parse-group [group-identifier line]
(condp = group-identifier
ID1 (handle-id1 line)
ID2 (handle-id2 line)
ID3 (handle-id3 line)))
or, if you want to leverage the fact that maps are functions:
(defn parse-group [group-identifier line]
(({ID1 handle-id1
ID2 handle-id2
ID3 handle-id3} group-identifier) line))
but then you lose some readability IMO.
On Monday, May 21, 2012 6:54:28 PM UTC+3, Christian Guimaraes wrote:
Hi all,
I'm struggling with when code structures and my imperative mindset.
What is the better approach (or functional approach) to work with a code
like the below?
(defn parse-group [group-identifier line]
(when (= group-identifier ID1)
(handle-id1 line))
(when (= group-identifier ID2)
(handle-id2 line))
(when (= group-identifier ID3)
(handle-id3 line)))
Thank you.
-- christian
--
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first post.
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Re: when function
or simply use `case` (case group-identifier ID1 (handle-id1 line) ID2 (handle-id2 line) ID3 (handle-id3 line)) 2012/5/21 Timothy Baldridge tbaldri...@gmail.com In this case I prefer either: (cond (= group-identifier ID1) (handle-id1 line) (= group-identifier ID2) (handle-id2 line) (= group-identifier ID3) (handle-id3 line)) Or just use core.match: (match [group-identifier] [ID1] (handle-id1 line) [ID2] (handle-id1 line) [ID3] (handle-id1 line)) But then again, I have this thing for pattern matching...it's so elegant. Timothy Baldridge On Mon, May 21, 2012 at 10:54 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hi all, I'm struggling with when code structures and my imperative mindset. What is the better approach (or functional approach) to work with a code like the below? (defn parse-group [group-identifier line] (when (= group-identifier ID1) (handle-id1 line)) (when (= group-identifier ID2) (handle-id2 line)) (when (= group-identifier ID3) (handle-id3 line))) Thank you. -- christian -- 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 -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- 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 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: when function
A multimethod might also be an appropriate way forward for you. +1 For multimethods, don't hardcode it if you don'tt have to. Timothy -- 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: when function
Hi, I think that multimethods will fit better in my case, since I have more than three ID's to handle. Thank you all for the answers. -- christian. On Mon, May 21, 2012 at 5:04 PM, Timothy Baldridge tbaldri...@gmail.comwrote: A multimethod might also be an appropriate way forward for you. +1 For multimethods, don't hardcode it if you don'tt have to. Timothy -- 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 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
