1. What is meant by the following statement?

# 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.

Answer: closure can return variablees so they're available in parent scope

var sayHello = function(name) {
  var text = 'Hello, ' + name;
  return function() {
    console.log(text);
  };
};

var helloTodd = sayHello('Todd');
helloTodd(); // will call the closure and log 'Hello, Todd'

sayHello('Bob')(); // call the returned function without assignment

2. How does the following code work?

function findLargestNumber(arrayOfNumbers) {
  return Math.max.apply(null, arrayofNumbers);
};

Math.max returns the largest of numbers
.apply pass an array as parameters to function

3. What is the purpose of the module pattern?

JS coding pattern (design pattern). Easy to read, maintain and edit. Use Objects in a nice way without repeating this and prototype.