Ensuring immutability in JavaScript means creating objects and values that cannot be changed once they are created.
While JavaScript does not have built-in support for immutability in the way that some other languages do, there are several practices and libraries that you can use to achieve this goal:

1. Using const for Variables: Declaring variables with const ensures that the variable itself cannot be reassigned, but if the variable is an object or an array, its contents can still be changed:

   const a = [1, 2, 3];
   a.push(4); // This will work because the array itself is mutable.
   a = [4, 5, 6]; // This will cause an error because `a` cannot be reassigned.

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