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Variables we declare in JavaScript with the help of const, they are not purely constants. Lets say that if we have a variable called config with a bunch of properties. And if we print it to the console, you will see that it has a name and the database object. But if we update the value for lets say appName to be xyz, you will see that we can do that, although it is a constant. JavaScript comes with a bunch of methods such as Object.freeze, Object.seal, and Object.preventExtensions which we can use to make our objects purely immutable. Lets look at the examples to understand how they work and how we can use them in our codebase to make our objects immutable. So first of all, we have Object.freeze. If we freeze an object, lets say, Object.freeze(config) and console.log the config.appName, you will see that we are still able to read the value from the config but if we try to update any of the existing values, lets say config.appName is XYZ, we will get the error that we cannot a