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September 13, 2020

Longer functions contain more code, and the more code developers write the more mistakes they are likely to make.
But wait, the evidence shows that most reported faults occur in short functions.
This is true, at least in Java. It is also true that most of a Java program’s code appears in short methods (in C 50% of the code is contained in functions containing 114 or fewer lines, while in Java 50% of code is contained in methods containing 4 or fewer lines). It is to be expected that most reported faults appear in short functions. — Impact of function size on number of reported faults