Challenge: Singleton Pattern

Problem statement

In this challenge, you have to implement a configuration that uses the singleton pattern. You are given a class ConfigureVals. Define it as follows:

• It should have a constructor that defines the properties xpoint, ypoint, and shape.

• The constructor should initialize xpoint, ypoint, and shape to 0, 0, and null if the values for these properties are not passed to the constructor.

• Only a single instance of the class can be made by defining the function getConfiguration.

Input

The getConfiguration method invoked

Output

The instance created after the getConfiguration function is invoked

Sample input

getConfiguration({ xpoint: 8, ypoint : 9, shape : rectangle }); //first call

getConfiguration({ xpoint : 2, ypoint : 4, shape : circle }); //second call

Sample output

ConfigureVals { xpoint: 8, ypoint: 9, shape: 'rectangle' }

ConfigureVals { xpoint: 8, ypoint: 9, shape: 'rectangle' }