Not able to get const use

#1

why did sir use " const" keyword during function and in argument and why not simply writing as normal??
why was it creating error when he did not use const?

#2

@varu those are comparator functions and only compares two objects, it cannot modify the data, so using const keyword makes sure that no data is modified accidentally.

#3

but we are also only comparing data and not even modifying in code then why to write additionly const

#4

hi @mayankA47 but still const keyword needs to be added so there’s no chance of even accidentally modifying the data