group-by example

groupby_ex.clj

user> (group-by #(cond (and (> % 10)
                            (< % 20))
                       :between-10-20

                       (and (> % 30)
                            (< % 40))
                       :between-30-40

                       (and (> % 90)
                            (< % 100))
                       :between-90-100

                       :else
                       :others)
                (range 100))
{:others [0 1 2 3 4 5 6 7 8 9 10 20 21 22 23 24 25 26 27 28 29 30 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90], :between-10-20 [11 12 13 14 15 16 17 18 19], :between-30-40 [31 32 33 34 35 36 37 38 39], :between-90-100 [91 92 93 94 95 96 97 98 99]}