ruby - having trouble to this "playlist_in_list.user.email" in rails -

i struggling understand following piece of line. partials inside views folder.

<span>owner: <%= h(playlist_in_list.user.email)%> </span> 

particularly following line

h(playlist_in_list.user.email) 

how can trace above line of code?

the partial passed local variable named playlist_in_list.

playlist_in_list associated user

user has method called email

my advice: partial called.

concerning h, it's html escape result.