Hands-On Server-Side Web Development with Swift

Using variables and tags in Leaf templating

The Leaf templating engine uses the # token to represent a tag, as seen in #(count) from the previous HTML code. The Leaf tag has general syntax: #Name( Args ){ Body }, where Name is the tag's name, Arg is a list of expected arguments, and Body is an optional element that often includes additional content.

Vapor provides many useful tagging usages and they are summarized in the following:

Tag	Usage
#capitalize(Var)	Converts Var into capitals	#capitalize(title)
#uppercase(Var)	Converts Var into all uppercase	#uppercase(title)
#lowercase(Var)	Converts Var into all lowercase	#lowercase(title)
#if(Condition)	Executes only if Condition is met	#if(title) { The title is #(title) }
#contains(Array, ...