Boost Readability: Replacing 'switch' With 'if' Statements

Hey guys! Ever stumble upon code that's a bit... clunky? Today, we're diving into a common coding issue where we can seriously boost readability. We're talking about swapping out those old-school switch statements with the more straightforward if statements. Let's break down why this is a good idea and how it can make your code cleaner and easier to understand.

The Core Problem: When 'switch' Overstays Its Welcome

So, what's the deal? Well, a switch statement is a control flow tool that lets you choose different code paths based on the value of a variable. It's like a decision tree, guiding your program down various routes. However, sometimes, we use switch when a simple if statement would do the job better. This is especially true when dealing with only one condition.

Consider this scenario. You have a switch statement with just one case and maybe a default. It's a bit like using a sledgehammer to swat a fly. It works, sure, but it's not the most elegant or efficient approach. This is where the readability issue pops up. Overuse or misuse of certain tools can often indicate a lack of understanding of the tool itself.

This rule highlights those moments where a switch statement has only one case and possibly a default one. The goal? To make our code as clear and concise as possible. Because let's face it, the clearer our code, the easier it is to debug, maintain, and collaborate on. That's the ultimate goal here!

Let's look at an example of what this would look like:

switch (condition) {
  case 0:
    doSomething();
    break;
  default:
    doSomethingElse();
    break;
}

In this case, a single if statement would be a better choice:

if (condition === 0) {
  doSomething();
} else {
  doSomethingElse();
}

See the difference? The if statement is more direct, easier to read, and perfectly suited for this single-condition scenario. That's the beauty of simplicity, right? The problem comes in the form of multiple switch statements and the use case of them. Often developers will opt for a switch when, again, a simple if or else statement would suffice.

The Benefits: Why Simplicity Matters

So, why should you care about swapping switch for if in these specific instances? Here's why:

• Improved Readability: The primary benefit is that your code becomes easier to scan and understand at a glance. if statements, when used for single conditions, are inherently simpler and more direct.
• Reduced Cognitive Load: When reading code, your brain has to process information. A simpler structure means less mental effort, letting you focus on what the code does rather than how it's structured.
• Easier Maintenance: Simpler code is generally easier to modify and debug. If you need to change the condition or the action, it's straightforward to locate and update the relevant if statement.
• Code Consistency: Sticking to a consistent style across your codebase makes it easier for everyone (including your future self) to understand and work with the code. If it's a single condition, use an if statement.

Real-World Examples: Spotting the Problem in Your Code

Now, let's look at where this issue might pop up in your projects. The original problem areas are in the context provided, so let's consider those:

1. packages/ketcher-core/src/domain/entities/simpleObject.ts:58
2. packages/ketcher-react/src/script/ui/state/common/index.ts:44
3. packages/ketcher-react/src/script/ui/state/floatingTools/index.ts:32
4. packages/ketcher-react/src/script/ui/state/saltsAndSolvents/index.ts:43
5. packages/ketcher-standalone/src/infrastructure/services/struct/standaloneStructService.ts:175
6. packages/ketcher-standalone/src/infrastructure/services/struct/standaloneStructService.ts:190

In each of these files, you'll likely find instances where a switch statement is used with only one case. The fix? Replace the switch with an if and an optional else (if a default case is present) to make the code more readable and maintainable. The goal is to simplify it as much as possible.

For instance, imagine you have a switch statement to determine the color of an object based on its state. If you only have one state to check, using an if statement to set the color directly is more efficient. The same goes for the rest of the examples.

How to Refactor: Step-by-Step Guide

Alright, let's get down to the nitty-gritty of refactoring your code. Here's a simple step-by-step guide to replacing a switch statement with if statements:

1. Identify the switch statement: Locate the switch statement in your code that has only one case and a possible default.
2. Analyze the condition: Determine the variable or expression that the switch statement is evaluating.
3. Write the if statement: Create an if statement that checks the same condition as the case in the switch statement. If there's a default in the switch, add an else block to the if statement.
4. Move the code: Copy the code inside the case block to the if block, and the code inside the default block (if any) to the else block.
5. Remove the switch statement: Delete the switch statement and its associated case and default blocks.
6. Test your code: Ensure your code works correctly after the refactoring. Test thoroughly.

Let's look at an example, again using this basic code:

switch (condition) {
  case 0:
    doSomething();
    break;
  default:
    doSomethingElse();
    break;
}

Would become this after refactoring:

if (condition === 0) {
  doSomething();
} else {
  doSomethingElse();
}

It's that easy, guys! Remember to test your code to make sure you haven't introduced any errors.

Beyond the Basics: Best Practices

Here are some best practices to keep in mind as you refactor:

• Keep it Simple: If you're dealing with multiple conditions, a switch statement might still be the way to go. But if it's just one, stick with if.
• Be Consistent: Follow a consistent style across your codebase. This makes it easier for everyone to understand and work with the code.
• Use Comments: If the logic is complex, add comments to explain why you're doing what you're doing. This helps future developers (and yourself) understand the code.
• Refactor Regularly: Don't wait until your code becomes a tangled mess. Refactor your code regularly to keep it clean and easy to work with.

Conclusion: Embracing the Power of Simplicity

So, there you have it! By swapping out unnecessary switch statements for if statements, you can significantly boost the readability and maintainability of your code. It's a small change that makes a big difference in the long run.

Remember, the goal is to write code that's clear, concise, and easy to understand. By following these simple guidelines, you'll be well on your way to becoming a better coder. Keep practicing, keep refactoring, and keep your code clean!

If you want to learn more about code readability and software development, check out the Software Engineering Institute (SEI). They have tons of resources and training programs to help you level up your skills.