How to Convert If Statements into a Nested Switch Statement in JavaScript

Learn how to effectively convert multiple `if statements` into a single nested `switch` statement using JavaScript to enhance your code clarity and maintainability.
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A Guide to Writing a Nested Switch Statement in JavaScript

When working with JavaScript, developers often encounter situations where they need to make decisions based on specific conditions. The most common approach to handling conditional logic is through if statements. However, there are scenarios where using a switch statement can make your code cleaner and more organized. In this guide, we'll delve into how to effectively convert a set of if statements into a nested switch statement, specifically focusing on an example involving payment processing.

Understanding the Problem

Imagine you have the following if statements that calculate payment processing fees using the Paystack API based on a given value:

[[See Video to Reveal this Text or Code Snippet]]

The above code checks if the value is less than 2500 to compute the fees, and if the computed fees exceed 2000, it caps the fees at 2000. While this works, it can be simplified further using a nested switch statement.

The Solution: Using a Nested Switch Statement

To transform the initial if statements into a more structured switch statement, we'll use switch(true), which allows us to evaluate boolean expressions in cases. Here's how the restructured code looks:

Step 1: Setting Up the First Switch

The first switch evaluates whether the value is under 2500 and calculates the fees accordingly:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Creating the Second Switch for Fee Capping

After computing the fees, we need a second switch to ensure that the fees do not exceed a certain threshold:

[[See Video to Reveal this Text or Code Snippet]]

Benefits of Using Switch Statements

Clarity: By organizing conditions into cases, your intentions become clearer to anyone reading the code.

Maintainability: Adding or altering conditions is straightforward with switches.

Performance: Although both approaches have similar performance, switches can be optimized better in some JavaScript engines.

Conclusion

Switch statements can be a powerful alternative to if-statements when handling multiple possible conditions based on a single variable. By converting your if statements into a single nested switch, you enhance your JavaScript code's clarity and efficiency.

Experiment with the provided structure, and feel free to extend the functionality further as needed. Happy coding!