Javascript scope question

Javascript scope question

1.
  Q: A function doesn't have to return in order to be called a closure. Simply accessing variables outside of the immediate lexical scope creates a closure.
  A: Nested functions, inner function access the outer function's variable. Then it's a closure, whether or not it return the variable to make it accessible outside.
2. 
  Q:function getMaxOfArray(numArray) {
  return Math.max.apply(null, numArray);
}
  A: This apply method takes an array as argument instead of argument list, so that we can use an array like object as argument.
  getMaxOfArray([1,2,3]) instead of Math.max(1,2,3)
3. 
  Q: What is the purpose of the module pattern?
  A: Modele parttern can create public method.