I agree that dividing the largerFunction into smaller ones has a non-negligible cost, and that cost is never mentioned at school. However, I still think that the benefits provided by moving them out outweigh it.
One think that I found beneficial is that by dividing the big functions into smaller ones, the resulting functions have the same abstraction level. To give an exaggerated example: I try to split my functions so that I never deal with Countries, Provinces, Cities, Buildings, People, Body Members, Organs & Cells in the same scope. I try to only deal with one of them per function (sometimes two, in parent-child cases).
I find that 1-abstraction-level functions are easier to understand, and I gladly "pay the price" of having extra one-use names around for this reason. I do try to restrict the scope of those "extra functions" as much as I can, put related functions together, and reduce side-effects as much as I humanly can.
The ones Karmack talks about. Several "concepts"(functions in this case) with implicit relationships (like what calls what, and in what order) are (sometimes) more difficult to process for a human brain than a huge block of sequential code.
The ones Karmack talks about. Several "concepts"(functions in this case) with implicit relationships (like what calls what, and in what order) are (sometimes) more difficult to absorve than a huge block of sequential code.
One think that I found beneficial is that by dividing the big functions into smaller ones, the resulting functions have the same abstraction level. To give an exaggerated example: I try to split my functions so that I never deal with Countries, Provinces, Cities, Buildings, People, Body Members, Organs & Cells in the same scope. I try to only deal with one of them per function (sometimes two, in parent-child cases).
I find that 1-abstraction-level functions are easier to understand, and I gladly "pay the price" of having extra one-use names around for this reason. I do try to restrict the scope of those "extra functions" as much as I can, put related functions together, and reduce side-effects as much as I humanly can.