Since the early days of programming, people have realized that the longer a function is, the more difficult it is to understand. Older languages carried an overhead in subroutine calls, which deterred people from small functions. Modern languages have pretty much eliminated that overhead for in-process calls. There is still overhead for the reader of the code because you have to switch context to see what the function does. Development environments that allow you to quickly jump between a function call and its declaration, or to see both functions at once, help eliminate this step, but the
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