Thank you! It make sense now :)
On Sunday, August 17, 2014 2:44:23 PM UTC+2, [email protected] wrote: > The boolean metadata is a type hint telling the ClojureScript compiler that > is-hidden is boolean. Knowing is-hidden is a boolean allows ClojureScript to > compile to > > if (is-hidden){ > } > else { > } > > instead of > > if (is-hidden != null && is-hidden !== false){ > } > else { > } > > if the type isn't known to be a boolean. The extra checks are needed because > ClojureScript has only two values that evaluate to false: false and nil. > JavaScript evaluates false, null undefined, "", 0, and NaN to be false. > > About the only time you need to use the boolean type hint is in performance > sensitive code where the compiler can't infer the type of a var (like a > parameter passed into a function). > > I hope this answers your question > > Peter Schuck -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/clojurescript.
