mapquest

"It is not down on any map. True places never are." - Herman Melville

a tiny clojure library of functions and macros for dealing with maps

Examples

merge-left

(merge-left & maps)

preserves keys in earlier maps

(merge-left 
    {:emergency-contact "917-283-3482"} 
    {:emergency-contact "911"}) 
=> {:emergency-contact "917-283-3482"}

reset-index

(reset-index map)

takes a map, and assigns its values to keys starting from 0

(reset-index {3 "rock" 4 "pebble" 6 "stone"}) 
=> {0 "rock" 1 "pebble" 2 "stone"}

embellish

(embellish test k v map)

if test is truthy, assoc k and v onto map, else return map

(let [hungry? true]
  (embellish
   hungry?  :food "purina"
   {:dog "claire"}))
=> {:dog "claire" :food "purina"}

(let [hungry? false]
  (embellish
   hungry? :food "mcdonalds"
   {:dog "claire"}))
=> {:dog "claire"}

keyword-in-set

(keyword-in-set name k set)

defines a predicate that accepts a map, and tests a key from that map for set membership

;; define predicate
(keyword-in-set 
    valid-suite? 
    :suite 
    #{"hearts" "spades" "clubs" "diamonds"})
=> #'user/keyword-in-set

;; call predicate on example map
(valid-suite? {:suite "spades" :rank "king"}) 
=> "spades"

;; call predicate on another example map
(valid-suite? {:suite "circles" :rank 8}) 
=> nil 

License

Copyright © 2021

This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.

This Source Code may also be made available under the following Secondary Licenses when the conditions for such availability set forth in the Eclipse Public License, v. 2.0 are satisfied: GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, with the GNU Classpath Exception which is available at https://www.gnu.org/software/classpath/license.html.