Clojure Core

Namespaces

clojure
- core
  - protocols
- data
- inspector
- java
  - browse
  - browse-ui
  - io
  - javadoc
  - shell
- main
- pprint
- reflect
- repl
- set
- stacktrace
- string
- template
- test
  - junit
  - tap
- walk
- xml
- zip

doc source examples comments

1.3.0

project

clojure.set

(project xrel ks)

Returns a rel of the elements of xrel with only the keys in ks

1 Example top

link | changes
```
;; `project` strips out unwanted key/value pairs from a set of maps. 
;; Suppose you have these descriptions of cows:

user=> (def cows #{  {:name "betsy" :id 33} {:name "panda" :id 34} })
#'user/cows

;; You care only about the names. So you can get them like this:

user=> (project cows [:name])
#{{:name "panda"} {:name "betsy"}}
```
;; `project` strips out unwanted key/value pairs from a set of maps. ;; Suppose you have these descriptions of cows: user=> (def cows #{ {:name "betsy" :id 33} {:name "panda" :id 34} }) #'user/cows ;; You care only about the names. So you can get them like this: user=> (project cows [:name]) #{{:name "panda"} {:name "betsy"}}

Source clojure/set.clj:71 top

(defn project
  "Returns a rel of the elements of xrel with only the keys in ks"
  {:added "1.0"}
  [xrel ks]
    (set (map #(select-keys % ks) xrel)))

Vars in clojure.set/project:

Used in 0 other vars

Comments top

1 comment(s) for project.

boxie

link

is there a function that is like project, but returns a set of hash-maps with with all the keys but the ones project was given?

ClojureDocs(beta)