I too find the code on the left/red (linear) more readable. However the version with all the functions is quite extreme. When I'm splitting my code into functio

I too find the code on the left/red (linear) more readable. However the version with all the functions is quite extreme. When I'm splitting my code into functions I decide if something should be it's own function on the basis of: is this chunk of functionality required to be reusable? Am I repeating code, only slightly changed? If the answer is yes, a function gets created. I never do what I assume authors did here, find the smallest logical units code can split into and generate a bajillion functions. I'm not paid by the line of code after all. The same reason makes me like object programming (especially inheritance, abstract functions, operator overloading). IMO with a good IDE such code is much more succinct(within the constraints of the language) and more readable, but taking it to extreme is a mistake.