Important Bits

Interview Cake Problem #11

December 10, 2014

I was on the right track with breaking down the problem. I was ready to start looking for sequences of matching cards across the deck and 2 piles, but the hint suggested to break the problem down further to matching individual cards. With that hint, I was able to implement a good solution.

I chose to actually pop and push elements from the arrays when doing comparisons between the piles instead of just incrementing an index every time a match was found. It is slower, but I think it is less prone to human off-by-one errors.

Neat JS stuff that came in handy

Need to make a shallow copy an array quickly? Try slice

var copy = original.slice(0)

Need to combine 2 arrays without creating a new array (like with concat()) ? Try using apply with push. push usually expects to receive a list of values as arguments instead of 1 array of values. apply helps with that.

original.push.apply(original, additional)

This says to run the push function in the scope of the array original, and will treat the array additional as a list of arguments the way push usually expects to receive values. The result is that the values in additional will be added to original.

Adam Sullovey

Written by Adam Sullovey, powered by Gatsby.
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tags: interview cake, javascript