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prolog accumulator

prolog accumulator

prolog accumulator

How can i create a prdicate for doubling every second entry of a list and discarding the others using an accumulator?
T = [o,o,g,g,e,e]

RE: prolog accumulator

If you use an accumulator, your predicate use 2 args for it, the current state of the accumulator and the final state of it.
Generally, if it's a list it's initialized with [].
The final state is unified when you have finished the work.
I can give you the beginning of the code :


double(['g',o,o,g,l,e],T) :-
  double(['g',o,o,g,l,e], 0, [], T).

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