Function - fundamental building block in the program - subprogram can be used multiple times - performs a task or calculates a value 1. Function declaration - function name(param1, param2) {body.. return;} - one function === one thing - naming: doSomething, command, verb ex) createCardAndPoint -> createdcard, createPoint - function is object in JS_ 변수할당가능, parameter전달, function return o function..