Re-usability of code is one of the main benefits of the bottom-up approach (Wikipedia)

I can't quite figure out how bottom-up approach enables code re-usability. I am aware that Object Oriented Programming is bottom-up approach and it has features such as inheritance that enable code re-usability. But I cannot connect bottom-up with code re-usability intuitively.

  • $\begingroup$ Wikipedia immediately follows that statement with a citation. Have you tried reading it to see what it says? $\endgroup$
    – D.W.
    Mar 10 at 19:15
  • $\begingroup$ Actually I couldn't find the source from that link. Also I would like to get a simple but understandable answer. $\endgroup$ Mar 11 at 15:55

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