SeenBefore

keeps a history of all items and answers whether an item has been seen by the constraint

object before.

superclass: AbstractConstraint

(

s = SeenBefore.new;

100.do({ arg i;

var r;

r = 100.rand;

if(s.value(r).not,{

[i,r].postln;

})

});

[ 0, 88 ]

[ 1, 19 ]

[ 2, 71 ]

[ 3, 83 ]

[ 4, 56 ]

[ 5, 97 ]

[ 6, 98 ]

[ 7, 78 ]

[ 8, 65 ]

[ 9, 63 ]

[ 10, 7 ]

[ 11, 5 ]

[ 12, 30 ]

[ 13, 53 ]

[ 14, 15 ]

[ 15, 70 ]

[ 16, 74 ]

[ 17, 44 ]

[ 18, 18 ]

[ 19, 66 ]

[ 22, 6 ]

[ 23, 60 ]

[ 24, 42 ]

[ 25, 95 ]

[ 26, 62 ]

[ 27, 96 ]

[ 28, 29 ]

[ 29, 81 ]

[ 30, 49 ]

[ 31, 13 ]

[ 32, 47 ]

[ 33, 59 ]

[ 34, 61 ]

[ 36, 34 ]

[ 37, 1 ]

[ 38, 0 ]

[ 43, 25 ]

[ 44, 3 ]

[ 46, 20 ]

[ 50, 16 ]

[ 51, 76 ]

[ 54, 87 ]

[ 55, 99 ]

[ 56, 90 ]

[ 57, 36 ]

[ 59, 57 ]

[ 60, 67 ]

[ 61, 45 ]

[ 62, 94 ]

[ 66, 86 ]

[ 69, 92 ]

[ 71, 80 ]

[ 72, 91 ]

[ 75, 89 ]

[ 79, 69 ]

[ 81, 35 ]

[ 84, 10 ]

[ 86, 73 ]

[ 87, 2 ]

[ 89, 8 ]

[ 93, 33 ]

[ 95, 31 ]

[ 98, 23 ]

)