Extending Groovy String class

Question

Groovy allows to do some nice things with strings in frontend pages, like:

${"hello".capitalize()}

How can I add a new custom method to the String class? Like:

${"hello".custom()}

Answer 1

Use the metaClass

String.metaClass.custom = { //dosomething }

See http://www.groovyexamples.org/2010/07/19/dynamically-add-properties-to-a-class/