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Normally when you add a MetaMethod, it is added for all instances of that class. However, for GroovyObjects, you can dynamically add methods to individual instances by giving that instance its own MetaClass.

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For Groovy version 1.6 and higher

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- any Groovy or Java object

Code Block
def str = "hello"
str.metaClass.test = { "test" }
assert "test" == str.test()
Note
title

For Groovy prior to version 1.6 - GroovyObjects only!

Code Block
def test = "test"
def gstr = "hello $test"     // this is a GString, which implements GroovyObject

def emc = new ExpandoMetaClass( gstr.class, false )
emc.test = { println "test" }
emc.initialize()

gstr.metaClass = emc
gstr.test()                  // prints "test"

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