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timsgardner/linq-test.clj

Created November 27, 2015 21:27
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linq-test.clj
;; works
(-> [[1 0] [1 0]]
(System.Linq.Enumerable/SelectMany identity)
vec)
;; doesn't
(-> [[1 0] [1 0]]
(System.Linq.Enumerable/SelectMany identity)
(System.Linq.Enumerable/Distinct (type-args System.Linq.Enumerable))
vec)
@nasser
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nasser commented Nov 27, 2015 

(macroexpand
  '(-> [[1 0] [1 0]]
    (System.Linq.Enumerable/SelectMany identity)
    (System.Linq.Enumerable/Distinct (type-args System.Linq.Enumerable))
    vec))

;; gives
(vec
 (System.Linq.Enumerable/Distinct
  (System.Linq.Enumerable/SelectMany [[1 0] [1 0]] identity)
  (type-args System.Linq.Enumerable)))

@timsgardner
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Author

ah right forgot order of type-args
still doesn't work, different error tho

(-> [[1 0] [1 0]]
  (System.Linq.Enumerable/SelectMany identity)
  (#(System.Linq.Enumerable/Distinct (type-args System.Collections.IEnumerable) %))
  vec)

@nasser
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nasser commented Nov 27, 2015

Ah, the type-arg for Distinct is the type of element in the collection, Object in this case. This does it

(->> (System.Linq.Enumerable/SelectMany [[1 0] [1 0]] identity) 
     (System.Linq.Enumerable/Distinct (type-args System.Object))
     vec)
;; [1 0]

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