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69 lines
2 KiB
Clojure
69 lines
2 KiB
Clojure
(ns uxbox.util.data
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"A collection of data transformation utils."
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(:require [cljs.reader :as r]))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Data structure manipulation
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; NOTE: commented because tansients are buggy in cljs?
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;; (defn index-by
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;; "Return a indexed map of the collection
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;; keyed by the result of executing the getter
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;; over each element of the collection."
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;; [coll getter]
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;; (let [data (transient {})]
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;; (run! #(do
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;; (println (getter %))
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;; (assoc! data (getter %) %)) coll)
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;; (println "test1:" (keys data))
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;; (let [r (persistent! data)]
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;; (println "test2:" (keys r))
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;; r)))
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;; (defn index-by
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;; "Return a indexed map of the collection
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;; keyed by the result of executing the getter
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;; over each element of the collection."
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;; [coll getter]
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;; (let [data (transient {})]
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;; (loop [coll coll]
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;; (let [item (first coll)]
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;; (if item
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;; (do
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;; (assoc! data (getter item) item)
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;; (recur (rest coll)))
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;; (let [_ 1 #_(println "test1:" (keys data))
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;; r (persistent! data)]
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;; (println "test2:" (keys r))
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;; r))))))
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(defn index-by
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"Return a indexed map of the collection
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keyed by the result of executing the getter
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over each element of the collection."
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[coll getter]
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(reduce (fn [acc item]
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(assoc acc (getter item) item))
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{}
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coll))
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(def ^:static index-by-id #(index-by % :id))
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(defn remove-nil-vals
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"Given a map, return a map removing key-value
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pairs when value is `nil`."
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[data]
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(into {} (remove (comp nil? second) data)))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Numbers Parsing
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defn read-string
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[v]
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(r/read-string v))
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(defn parse-int
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[v]
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(js/parseInt v 10))
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