Hi, I have a simple general question about variables used in Clojure. Often you have an object that must be referenced because it is established at run time and not known beforehand. Lets say we have an block object and it has a certain height. We create a reference to the block's height and use it throughout the program. But there are many cases where we have to know HALF the height of the block. My question is, is it more efficient to create another reference for half the block's height or to calculate the half height value every time it is needed?
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