;; | |
;; NS CHEATSHEET | |
;; | |
;; * :require makes functions available with a namespace prefix | |
;; and optionally can refer functions to the current ns. | |
;; | |
;; * :import refers Java classes to the current namespace. | |
;; | |
;; * :refer-clojure affects availability of built-in (clojure.core) | |
;; functions. | |
;; | |
;; Updated: 12/09/2016 ~ghoseb | |
(ns foo.bar | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Refers clojure.string into current NS, e.g.: | |
;; (clojure.string/lower-case "FooBar) | |
(:require [clojure.string]) | |
;; Refers string into current NS, e.g.: | |
;; (string/lower-case "FooBar") | |
(:require [clojure.string :as string]) | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Refers all functions from clojure.string and | |
;; clojure.set into current NS, e.g.: | |
;; (union #{:a :b} #{:a :c} #{:b :d}) | |
;; (lower-case "FooBar") | |
(:require [clojure.string :refer :all] | |
[clojure.set :refer :all]) | |
;; Refers only lower-case and union into current NS, e.g.: | |
;; (union #{:a :b} #{:a :c} #{:b :d}) | |
;; (lower-case "FooBar") | |
(:require [clojure.string :refer [lower-case]] | |
[clojure.set :refer [union]]) | |
;; Refers ancestors & descendants into current NS as xml-ancestors & xml-descendants | |
(:require clojure.data.zip) | |
(:refer [clojure.data.zip :rename {ancestors xml-ancestors, | |
descendants xml-descendants}]) | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Refers ArrayList and HashMap into current NS: | |
(:import [java.util ArrayList HashMap]) | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Excludes built-in print | |
(:refer-clojure :exclude [print]) | |
;; Excludes all built-ins except print | |
(:refer-clojure :only [print]) | |
;; Renames built-in print to core-print | |
(:refer-clojure :rename {print core-print}) | |
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
;; Reload all dependencies while loading the ns | |
(:require [clojure.string :as cs :refer [split join]] :reload) | |
;; Be verbose about loading the deps | |
(:require [clojure.string :as cs :refer [split join]] :verbose) | |
;; There is also :reload-all that reloads every depenency in the ns | |
(:require [clojure.string :refer [split join]] :reload-all) | |
;; Everything together | |
(:require [clojure.string :as cs :refer [split join]] :verbose :reload)) |
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Hmm. On "what means (:require [io.pedestal.service.http.route.definition :refer [defroutes]]) ", I got two hypotheses :
Don't know which would be right :/ if any ;) |
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I think I got it. On the pedestal tutorial, http://pedestal.io/documentation/connecting-to-datomic/ where we get access to every function by prefixing d/ in front of it. Except for the q function that we can access directly, thanks to :refer. :) |
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I suggest adding the following as the combination of ;; Refers sqrt into current NS as ccm-sqrt, other math functions are not
;; refered, e.g.
;; (ccm-sqrt 4)
[:use [clojure.contrib.math :only [sqrt] :rename {sqrt ccm-sqrt}]] |
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@cmpitg as far as I know :use is deprecated. |
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:refer lets you use the function without the namespace qualifier. (ns wawa (= (d/q args) (q args) (datomic.api/q args) ) |
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Awesome. I never get this right. |
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In my case, i need to set require with refering to some function, but already have that name bounded to another func(addevent). It's was too straightforward for me to be assume immediately.
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thanks bro greetings get to know |
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What is the meaning of :refer in the following :
(:require [io.pedestal.service.http.route.definition :refer [defroutes]]
thanks!