First Class Functions - Examples of passing classes around

component_a.cfc

component { 
  
  public function init(){
    return this;
  }
  
  public function otherFunc(){
    echo("called!");
  }

}

component_b.cfc

component { 
  
  public function init(){
    var a = new component_a(); //instantiate a
    
    this.otherFunc = a.otherFunc; //Copy otherFunc from a to b
    
    this.otherFunc(); //Outputs "called!"
    
    call(this.otherFunc);
    
    return this;
  }
  
  private function call(required function func){
    echo(arguments.func()); //An example of passing a function, executes otherFunc, outputs "called!"
  } 

}

firstClassFunctionsTest.cfc

/**
* My xUnit Test
*/
component extends="testbox.system.BaseSpec"{
	
/*********************************** LIFE CYCLE Methods ***********************************/

	// executes before all test cases
	function beforeTests(){
	}

	// executes after all test cases
	function afterTests(){
	}

	// executes before every test case
	function setup( currentMethod ){
	}

	// executes after every test case
	function teardown( currentMethod ){
	}

/*********************************** TEST CASES BELOW ***********************************/
	
	// Remember that test cases MUST start or end with the keyword 'test'
	function componentATest(){
		new component_a();
	}

	function componentBTest(){
		new component_b();
	}

	function componentBOutputTest(){
		savecontent variable="outputs"{
			new component_b();			
		}
		expect(outputs).toBe("called!called!");
	}
	
}