You don't have to do it exactly like that or probably 'google the stack overflow' once you've used kill & lsof (whether for this purpose of something else). My thought as GP's as soon as I read the title was 'lsof & kill?' - I doubt they looked up the pretty simple command they gave.

And as they said, 'which you can easily turn into an alias [well, a function]', which you could call 'killport' if you want for exactly the same functionality.