Re: Basic question: what's the difference between require as and use as?
I always have (:use clojure.core) in a new namespace. Is that necessary or is clojure.core is automatically interned when a new namespace is created? On Jun 23, 2015, at 6:37 AM, Gary Verhaegen gary.verhae...@gmail.com wrote: Unless you have a very compelling reason, just don't use use. It's mostly a historical accident that's kept there for backwards compatibility. And try to avoid :refer :all if possible. There are legitimate use-cases for it, but outside the REPL they are pretty rare. On Tuesday, 23 June 2015, Ritchie Cai ritchie...@gmail.com mailto:ritchie...@gmail.com wrote: Ah, I see. I thought “use :as” will not intern all the symbols into current namespace, apparently that’s not the case. Thanks for clearing this up. Ritchie On Jun 22, 2015, at 4:52 PM, Sean Corfield s...@corfield.org javascript:; wrote: On Jun 22, 2015, at 2:39 PM, Ritchie Cai ritchie...@gmail.com javascript:; wrote: Ok, so require without :refer will default to :refer :all? No. (:use [clojure.java.io http://clojure.java.io/]) is equivalent to (:require [clojure.java.io http://clojure.java.io/ :refer :all]) There’s no :as here. :use is like :require :refer :all. (:use [clojure.java.io http://clojure.java.io/ :as io]) is equivalent to (:require [clojure.java.io http://clojure.java.io/ :as io :refer :all]) There’s an :as in both here. :use :as is like :require :as :refer :all Both :use and :refer :all (in :require) are discouraged because they pollute your namespace with every symbol from the used/required namespace. There’s not much point in specifying an alias (with :as) for :use or :require :refer :all since those bring in every symbol directly anyway. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 javascript:; 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 javascript:; For more options, visit this group at http://groups.google.com/group/clojure?hl=en http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com javascript:;. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- 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 javascript:; 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 javascript:; For more options, visit this group at http://groups.google.com/group/clojure?hl=en 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 javascript:;. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- 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 http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- 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
Re: Basic question: what's the difference between require as and use as?
I see. Thanks. On Jun 23, 2015, at 11:02 AM, Fluid Dynamics a2093...@trbvm.com wrote: On Tuesday, June 23, 2015 at 10:40:25 AM UTC-4, Ritchie Cai wrote: I always have (:use clojure.core) in a new namespace. Is that necessary or is clojure.core is automatically interned when a new namespace is created? It depends. Yes if you use (ns foo) ..., but not apparently if you use (in-ns 'foo) which might be done in certain metaprogramming situations, or during repl experimentation. -- 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 http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout https://groups.google.com/d/optout. -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
On Tuesday, June 23, 2015 at 10:40:25 AM UTC-4, Ritchie Cai wrote: I always have (:use clojure.core) in a new namespace. Is that necessary or is clojure.core is automatically interned when a new namespace is created? It depends. Yes if you use (ns foo) ..., but not apparently if you use (in-ns 'foo) which might be done in certain metaprogramming situations, or during repl experimentation. -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
Unless you have a very compelling reason, just don't use use. It's mostly a historical accident that's kept there for backwards compatibility. And try to avoid :refer :all if possible. There are legitimate use-cases for it, but outside the REPL they are pretty rare. On Tuesday, 23 June 2015, Ritchie Cai ritchie...@gmail.com wrote: Ah, I see. I thought “use :as” will not intern all the symbols into current namespace, apparently that’s not the case. Thanks for clearing this up. Ritchie On Jun 22, 2015, at 4:52 PM, Sean Corfield s...@corfield.org javascript:; wrote: On Jun 22, 2015, at 2:39 PM, Ritchie Cai ritchie...@gmail.com javascript:; wrote: Ok, so require without :refer will default to :refer :all? No. (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :refer :all]) There’s no :as here. :use is like :require :refer :all. (:use [clojure.java.io :as io]) is equivalent to (:require [ clojure.java.io :as io :refer :all]) There’s an :as in both here. :use :as is like :require :as :refer :all Both :use and :refer :all (in :require) are discouraged because they pollute your namespace with every symbol from the used/required namespace. There’s not much point in specifying an alias (with :as) for :use or :require :refer :all since those bring in every symbol directly anyway. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 javascript:; 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 javascript:; For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com javascript:;. For more options, visit https://groups.google.com/d/optout. -- 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 javascript:; 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 javascript:; 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 javascript:;. For more options, visit https://groups.google.com/d/optout. -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
On Jun 22, 2015, at 1:50 PM, Ritchie Cai ritchie...@gmail.com wrote: For example: (:require [clojure.java.io :as io]) vs (:use [clojure.java.io :as io]) In both cases, we can end up using it with (io/function name ... ). Is there a difference at all? Yes, (:use [clojure.java.io :as io]) is equivalent to (:require [clojure.java.io :as io :refer :all]) so it refers in all of the symbols from that namespace directly into your namespace (i.e., they can be referenced even without the io/ prefix). Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
Ok, so require without :refer will default to :refer :all? On Jun 22, 2015, at 4:32 PM, Sean Corfield s...@corfield.org wrote: On Jun 22, 2015, at 2:22 PM, Ritchie Cai ritchie...@gmail.com wrote: You mean (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :as io :refer :all])? Not quite, (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :refer :all]) Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
You mean (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :as io :refer :all])? Ritchie On Jun 22, 2015, at 4:15 PM, Sean Corfield s...@corfield.org wrote: On Jun 22, 2015, at 1:50 PM, Ritchie Cai ritchie...@gmail.com wrote: For example: (:require [clojure.java.io :as io]) vs (:use [clojure.java.io :as io]) In both cases, we can end up using it with (io/function name ... ). Is there a difference at all? Yes, (:use [clojure.java.io :as io]) is equivalent to (:require [clojure.java.io :as io :refer :all]) so it refers in all of the symbols from that namespace directly into your namespace (i.e., they can be referenced even without the io/ prefix). Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
On Jun 22, 2015, at 2:39 PM, Ritchie Cai ritchie...@gmail.com wrote: Ok, so require without :refer will default to :refer :all? No. (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :refer :all]) There’s no :as here. :use is like :require :refer :all. (:use [clojure.java.io :as io]) is equivalent to (:require [clojure.java.io :as io :refer :all]) There’s an :as in both here. :use :as is like :require :as :refer :all Both :use and :refer :all (in :require) are discouraged because they pollute your namespace with every symbol from the used/required namespace. There’s not much point in specifying an alias (with :as) for :use or :require :refer :all since those bring in every symbol directly anyway. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
Ah, I see. I thought “use :as” will not intern all the symbols into current namespace, apparently that’s not the case. Thanks for clearing this up. Ritchie On Jun 22, 2015, at 4:52 PM, Sean Corfield s...@corfield.org wrote: On Jun 22, 2015, at 2:39 PM, Ritchie Cai ritchie...@gmail.com wrote: Ok, so require without :refer will default to :refer :all? No. (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :refer :all]) There’s no :as here. :use is like :require :refer :all. (:use [clojure.java.io :as io]) is equivalent to (:require [clojure.java.io :as io :refer :all]) There’s an :as in both here. :use :as is like :require :as :refer :all Both :use and :refer :all (in :require) are discouraged because they pollute your namespace with every symbol from the used/required namespace. There’s not much point in specifying an alias (with :as) for :use or :require :refer :all since those bring in every symbol directly anyway. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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 a topic in the Google Groups Clojure group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/clojure/ned76MpB-W0/unsubscribe. To unsubscribe from this group and all its topics, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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/d/optout.
Re: Basic question: what's the difference between require as and use as?
On Jun 22, 2015, at 2:22 PM, Ritchie Cai ritchie...@gmail.com wrote: You mean (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :as io :refer :all])? Not quite, (:use [clojure.java.io]) is equivalent to (:require [clojure.java.io :refer :all]) Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- 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/d/optout.
