Ask him what will he do when he finds a bug in his code. How many places will he now need to fix it in?
You can also show him the answers to this question (Why is “copy and paste” of code dangerous?).
Ask him what will he do when he finds a bug in his code. How many places will he now need to fix it in?
You can also show him the answers to this question (Why is “copy and paste” of code dangerous?).