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Alex Rivera
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The canonical Array difference example in Ruby is: [ 1, 1, 2, 2, 3, 3, 4, 5 ] - [ 1, 2, 4 ] #=> [ 3, 3, 5 ] What's the best way to get the following behavior instead? [ 1, 1, 2, 2, 3, 3, 4, 5 ].subtract_once([ 1, 2, 4 ]) #=> [ 1, 2, 3, 3, 5 ] That is, only the first instance of each matching item in the second array is removed from the first array.
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