Benchmark: if-else vs switch4

Tests:

Switch case
const a = 1; switch (a) { case 5: console.log("a is 5"); break; case 4: console.log("a is 4"); break; case 3: console.log("a is 4"); break; }
if-else
const a = 1; if (a == 5) { console.log("a is 5"); } else if (a == 4) { console.log("a is 4"); } else if (a == 3) { console.log("a is 4"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Switch case
if-else

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
Switch case	208756192.0 Ops/sec
if-else	184000848.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark JSON and explain what is being tested.

**Benchmark Definition**

The benchmark definition is a simple script that checks the execution time of two different conditional statements: `switch` and `if-else`. The script defines a constant `a` with value 1, and then uses both constructs to check if `a` equals 3, 4, or 5. If the condition is true, it logs a message to the console.

**Script Preparation Code**

There is no script preparation code provided for this benchmark, which means that the test environment will be set up automatically when running the benchmark.

**Html Preparation Code**

Similarly, there is no html preparation code provided, which suggests that the benchmark is focused on measuring the execution time of the JavaScript code itself, without considering any UI-related overhead.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **Switch Case**: This test case uses a `switch` statement to check if `a` equals 3, 4, or 5.
2. **if-else**: This test case uses an `if-else` chain to check if `a` equals 3, 4, or 5.

**Library and Special JS Features**

Neither of the two test cases uses any external libraries. There are no special JavaScript features or syntax used in these examples, such as async/await, Promises, or destructuring assignments.

**Comparison Options**

The benchmark is comparing the execution time of the `switch` statement versus the `if-else` chain. This comparison is likely intended to test which construct is faster for this specific use case.

**Pros and Cons of Each Approach**

Here are some general pros and cons of each approach:

* **Switch Statement**:
	+ Pros: Can be more concise and expressive, especially when dealing with multiple cases.
	+ Cons: May have slower performance due to the overhead of looking up the value in an array (switch table).
* **if-else Chain**:
	+ Pros: Generally faster, as it only requires a single lookup operation.
	+ Cons: Can be more verbose and harder to read, especially for complex cases.

**Other Considerations**

When choosing between `switch` and `if-else`, consider the following:

* Code readability: If readability is important, `if-else` might be a better choice, as it allows for clear and explicit condition checks.
* Performance: For simple cases with few options, `switch` might be faster. However, for more complex cases or larger datasets, `if-else` might be more efficient.

**Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

* **Use Cases**: If the use case requires multiple conditional statements with different types of logic (e.g., string comparison vs. numeric comparison), consider using a library like `switch-case` or `if-else`.
* **Template literals**: For more complex cases where you need to handle multiple conditions with variable values, consider using template literals and the `?.` operator.
* **Object-based conditionals**: Some modern JavaScript implementations (e.g., ES2017+) offer object-based conditionals, which can simplify certain use cases.

Keep in mind that these alternatives might not be relevant for simple cases like this benchmark.

Related benchmarks:

if-else vs switch4 (version: 0)

Comparing performance of: Switch case vs if-else

Created: 2 years ago by: Registered User

Jump to the latest result

Switch case

if-else

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):