Playing with group-by and destructuring

repl_history.clj

(def numbers [0 1 2 3 4 5 6 7 8 9])
=> #'es.joaquincaro.katas.Greeting/numbers
(filter odd? numbers)
=> (1 3 5 7 9)
(group-byodd? numbers)
CompilerException java.lang.RuntimeException: Unable to resolve symbol: group-byodd? in this context, compiling:(/private/var/folders/6p/p1cct37x19bgtnss368w24mm0000gn/T/form-init4565011324126899375.clj:1:1) 
(group-by odd? numbers)
=> {false [0 2 4 6 8], true [1 3 5 7 9]}
(let [[pares even? impares odd?]] (group-by odd? numbers))
IllegalArgumentException let requires an even number of forms in binding vector in es.joaquincaro.katas.Greeting:1  clojure.core/let (core.clj:4333)
(let [pares even? impares odd?] (group-by odd? numbers))
=> {false [0 2 4 6 8], true [1 3 5 7 9]}
(let [pares (get (group-by odd? numbers) false)]
  pares)

=> [0 2 4 6 8]
(let [are-they-odd (group-by odd? numbers)
      pares (get are-they-odd false)]
  pares)

=> [0 2 4 6 8]
(let [are-they-odd (group-by odd? numbers)
      {pares false} are-they-odd]
  pares)

=> [0 2 4 6 8]
(let [are-they-odd (group-by odd? numbers)
      {impares (not false)} are-they-odd]
  impares)

=> [1 3 5 7 9]
(let [are-they-odd (group-by odd? numbers)
      {x ((comp not) false)} are-they-odd]
  x)

=> [1 3 5 7 9]
(let [are-they-odd (group-by odd? numbers)
      {x ((comp not not) false)} are-they-odd]
  x)

=> [0 2 4 6 8]
(let [are-they-odd (group-by odd? numbers)
      {x ((comp not not identity) false)} are-they-odd]
  x)

=> [0 2 4 6 8]
(let [are-they-odd (group-by odd? numbers)
      {x false} are-they-odd]
  x)

=> [0 2 4 6 8]