This notion that you do not need any kind of mathematical knowledge is widespread. Ever tried to delete 1 000 000 files in Windows Explorer ? Select All, Shift

This notion that you do not need any kind of mathematical knowledge is widespread. Ever tried to delete 1 000 000 files in Windows Explorer ? Select All, Shift delete ? Takes ages. Why ? because Explorer creates a list of files to be deleted by adding one after the other to the list while updating the screen. del bak\[asterisk.asterisk] /S /Q /Y >NUL takes some time, but is way faster. rmdir bak drops the entire directory and returns instantly. The difference ? O(n^2) versus O(n) versus O(1) Useful knowledge ? ... possibly. Even then 'just' programming a website, winging full stack or doing anything worthwile you can get by without knowledge, but it sure helps... P.S. how do you escape an asterisk ? Even google didn't know / i didn't find it...