Example of Extension Methods on Strings in Xtend

ExtensionMethodsTest.xtend

import junit.framework.Assert
import org.junit.Test

class ExtensionMethodsTest {
	
	@Test
	def shouldBeNull() {
		var String myTestString = null;
		Assert::assertTrue(myTestString.isEmptyOrNull());
	}
	
	@Test
	def shouldBeEmpty() {
		var String myTestString = "";
		Assert::assertTrue(myTestString.isEmptyOrNull());
	}
	
	def isEmptyOrNull(String s) {
		s == null || s.isEmpty()
	}
	
}