Function exerciseone(userclass){// exercise one: in this exercise you are given a class called userclass.// you will be adding a method to the prototype called greeting// this method will return the string: 'hello, it is nice to meet you! '// do not create a new class or object // write your code in the lines abovereturn userclass}function exercisetwo(animalclass){// exercise two: in this exercise you are given a class called animalclass.// the class will already have the properties 'name', 'noise' on it.// you will be adding a method to the prototype called 'speak'// using the 'this' keyword, speak should return the following string: // ' says '// do not create a new class or object // write your code in the lines abovereturn animalclass}