EL expressions are always used within curly braces, and prefixed with a dollar($) sign and $(expression). The first named variable in the expression is either an implicit object or an attribute stored in one of the the four scopes i.e. page, request, sess
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EL expressions are always used within curly braces, and prefixed with a dollar($) sign and $(expression). The first named variable in the expression is either an implicit object or an attribute stored in one of the the four scopes i.e. page, request, session, or application. The [] operator is much more powerful than the dot, because it lets you access Map key or a bean property name as well as the access to arrays and Lists.
Map stores the values in the form of a key- value pair. Map can't have a duplicate keys, and each key is associated with at least one value. In map we can retrieve the value by using ${map["0"]}.
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Rate Tutorial: Using [ ] operator of EL with the Map
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