jquery - Conditionally executing javascript & performance -


i've inherited project i'm seeing lot of conditional lines in coffeescript files such 

$ -> if $('#listing_address').length > 0   #javascript here

which is, understand, executing following javascript if first finds #listing_address element on page.

does have noticeable performance benefit? standard practice? should giving pages unique id, executing page's javascript on page needed?

as @kevinb said, depend on code there's after. simple $('.x').show()? if yes, doesn't matter.

but instead of using style, i'd rather recommend use modules (like, commonjs modules) , require 1 page. believe you're using rails (because seems js code compilated), can use sprockets gems allow use files modules


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