Awesome
kezban 
Utility library for Clojure and ClojureScript.
The library targets Clojure 1.8 and above.
Leiningen
Usage
kezban.core
;;use kezban.core
(use 'kezban.core)
when-let*
user=> (when-let* [a 1 b 2 c 3]
(println "I <3 Clojure")
a)
=> "I <3 Clojure"
=> 1
;;returns nil when one binding is nil or false
user=> (when-let* [a 1 b nil c 3]
(println "Please print me!")
a)
=> nil
if-let*
user=> (if-let* [a 1 b 2 c (+ a b)]
c)
=> 3
;;returns then part when one binding is nil or false
user=> (if-let* [a 1 b nil c 3]
"Nope not here"
"Here I Am!")
=> "Here I Am!"
cond-as->
(cond-as-> 1 n
true (+ n 1)
false (+ n 2)
true (+ 5 n))
=> 7
->>>
;; Alternative to ->, ->> and (comp) with one arg
;; Applying Left-To-Right
;; First Argument has to be a value(input)!
;; comp equivalent: ((comp #(+ 1 %) #(+ % 1) inc) 5)
;; standard equivalent (+ 1 (+ (inc 5) 1))
user=> (->>> 5 inc #(+ % 1) #(+ 1 %)) ;;5 is the input
=> 8
;; comp equivalent: ((comp inc second reverse) '("a" 2 8 "b"))
;; standard equivalent (inc (second (reverse '("a" 2 8 "b"))))
user=> (->>> '("a" 2 8 "b") reverse second inc) ;;'("a" 2 8 "b") is the input
=> 9
nth-safe
(def coll [1 2 3 4 5])
user=> (nth-safe coll 0)
=> 1
user=> (nth-safe coll 12)
=> nil
user=> (nth-safe coll 12 "not-found-value")
=> "not-found-value"
nnth
(nnth [1 [2 3 [4 5]]] 1 2 1)
=> 5
def-
(def- my-coll [1 2 3])
=> #'kezban.core/my-coll
(:private (meta #'kezban.core/my-coll))
=> true
xor
(xor false true nil)
=> true
(xor false nil)
=> nil
pprint-macro
(pprint-macro (when-let [a 1]
(println a)))
(let*
[temp__4657__auto__ 1]
(if temp__4657__auto__ (do (let* [a temp__4657__auto__] (println a)))))
=> nil
quoted?
(quoted? '(+ 1 2))
=> true
(quoted? (+ 1 2))
=> false
array?
(array? (int-array 1))
=> true
(array? :int (int-array 1))
=> true
lazy?
(lazy? (map inc [1 2 3]))
=> true
any-pred
(filter (any-pred even? odd?) [2 4 5 7])
=> (2 4 5 7)
try-> and try->>
(try-> 5 inc dec str inc) ;;also thread last version: try->>
=> nil
multi-comp
(def data [{:v 12, :a 10} {:v 21, :a 113} {:v 1, :a 2} {:v 12, :a 223} {:v 100, :a 23} {:v 1, :a 113}])
(sort #(multi-comp [:a :v] > %1 %2) data)
;or
(sort #(multi-comp [:a :v] %2 %1) data)
=> ({:v 12, :a 223} {:v 21, :a 113} {:v 1, :a 113} {:v 100, :a 23} {:v 12, :a 10} {:v 1, :a 2})
with-out
(with-out
(println "Normal out")
(.println (System/err) "Error occurred!"))
=> {:err "Error occurred!\n", :out "Normal out\n"}
letm
(letm [a 1
b (+ a 1)])
=> {:a 1, :b 2}
in?
(in? 3 [1 2 3 4])
=> true
take-while-and-n-more
(take-while-and-n-more even? 2 [2 4 6 7 9 13 15])
=> (2 4 6 7 9)
dissoc-in
(dissoc-in {:a {:b {:c 1 :d 2}}} [:a :b :d])
=> {:a {:b {:c 1}}}
with-timeout
(with-timeout 100
(Thread/sleep 1500))
=> CompilerException java.util.concurrent.TimeoutException
(with-timeout 1000
(Thread/sleep 500)
5)
=> 5
url->file
(url->file "http://file.url" (io/file "your file path to get content"))
=> returns your file instance
cond-let
(cond-let [a 5
b (+ a 1)]
(even? a)
(println "a is odd")
(even? b)
(println "b is even"))
b is even
=> nil
keywordize
(keywordize "hey Whats Up?")
=> :hey-whats-up?
source-clj-file
(source-clj-file 'clojure.string)
=> returns clojure.string's namespace source code in string
time*
;;unlike time, time* allows you to provide more than one form
(time*
(Thread/sleep 2500)
12)
=> {:duration 2505.328818, :result 12}
process-lazy-seq
(process-lazy-seq (fn [i]
(println (inc i))) 10000 (range))
;; we can process 10000 data at time and not getting OutOfMemory Exception
when-no-aot
;; binding will happen when *compile-files* set to false
(def db-conn (when-no-aot (create-db-connection!)))
defay
(defay current-time (println "Hi!") (System/currentTimeMillis))
;; Hi!
;;=> 1587327846466
@current-time
;;=> 1587327846466
;; Expands to this:
(def current-time (delay (println "Hi!")
(System/currentTimeMillis)))
(when-not *compile-files* @current-time)
locals
(defn my-fn
[a]
(let [b 2]
(locals)))
(my-fn 1)
;;=> {a 1, b 2}
prog1
(prog1 (+ 1 2)
(println "Result: " <>))
;;Result: 3
;;=> 3
defm
(defm my-add [x y]
(println "Result: " (+ x y))
(+ x y))
(my-add 1 2)
;;Result: 3
;;=> 3
(my-add 1 2)
;;=> 3
Memoized function, expands to this:
(def my-add
(memoize
(fn [x y]
(println "Result: " (+ x y))
(+ x y))))
License
Copyright © 2022 Ertuğrul Çetin
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.