Introduction to "Use Strict"; const README = "One"; selfDescription = "Two";

As a programmer, it is important to understand the role of "use strict" in JavaScript. When this directive is included at the beginning of a script or function, it enforces stricter parsing and error handling rules. This helps prevent common mistakes and catches potential issues before they become runtime errors.

Now, let's examine the following code:

const README = "One";
selfDescription = "Two";

These two lines of code declare two variables: README and selfDescription. However, there is a key difference between them.

The first line uses the const keyword to declare README. This means that README is a constant variable, and its value cannot be changed.

On the other hand, the second line simply assigns a value to selfDescription without declaring it with const, let, or var. This means that selfDescription is a global variable, and its value can be changed throughout the program.

It is good practice to use const, let, or var when declaring variables in JavaScript. This helps prevent unintended changes to variables, improves code readability, and conforms to best coding practices.

Overall, understanding the importance of "use strict" and variable declarations is crucial for writing robust and maintainable JavaScript code.