Challenge: MVVM Pattern

Problem statement

In this challenge, you need to use the MVVM pattern to change the color of the “color” you write in the input field.

In the Model, you need to define the following functions:

• subscribe: Registers an observer

• notifyObservers: Notifies the observer of a change

• getCurrentColor: Returns the current color

• setColor: Sets a new color

In the ViewModel, you need to define the bind function, which reflects changes made in the view on the model and vice versa. It should do the following as well:

• If you write green in the input, the color of the text green should change to red

• If you write red in the input, the color of the text red should change to blue

• If you write blue in the input, the color of the text blue should change to green

The view is provided to you in the form of the HTML code. Study it carefully before writing the JavaScript code.

Input

The name of the color

Output

The color of the text changes to green, red, or blue according to the rules given

Sample input

green
red
blue 

Sample output

green

red

blue