Benchmark: switch vs if 2 - MeasureThat.net

HTML Preparation code:

<div class="test"></div>

Script Preparation code:

var v = true;
var d = false;

Tests:

switch
switch (v) { case true: break; case false: break; ; }
if
if (v ) { } else { }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
switch
if

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 test cases and explain what's being tested, compared, and some pros and cons of each approach.

**Benchmark Definition**

The benchmark definition is represented by two JSON objects that contain the necessary information to prepare and execute the tests.

1. The first object defines a new benchmark with the name "switch vs if 2". It includes:
	* A brief description (which is currently empty)
	* A script preparation code: `var v = true; var d = false;`. This code initializes two variables, `v` and `d`, to `true` and `false` respectively. This setup will likely be used as a test case for the comparison between switch statements and if-else statements.
	* An HTML preparation code: `<div class="test"></div>`. This is likely a placeholder for displaying the results of the benchmark.

2. The second object defines another new benchmark with an identical structure, but this time it's testing the `if` statement instead.

**Test Cases**

The test cases themselves are defined in the "Benchmark Definition" section as part of each benchmark definition. Here's what we can learn about these test cases:

1. For the "switch" case:
	* The script is a simple switch statement with two cases: one for `true` and another for `false`.
	* In both cases, it breaks out of the switch block.
2. For the "if" case:
	* The script is an if-else statement with two branches: one for `v` being truthy and another for when it's falsy.

**Library Usage**

There isn't any explicit library usage mentioned in these test cases, but we can make some educated guesses:

* The use of the break statement inside both switch statements suggests that the benchmark might be testing the control flow between different branches.
* In the `if` case, there's no library usage explicitly stated, but if we were to look for an optimization technique being tested (like compiler optimizations), a possible interpretation would be looking at how compilers optimize if-else statements.

**Special JavaScript Feature/Syntax**

There are no special JavaScript features or syntaxes that appear in these test cases. The switch statement is a standard part of the language, and if-else statements are also fundamental constructs.

**Comparing Approaches**

Now let's discuss the comparison between switch statements and if-else statements in this benchmark:

* **Switch Statement:**
	+ Pros:
		- Can be faster when used with known values (since they don't involve a function call to evaluate conditions).
		- More concise for simple, discrete cases.
	+ Cons:
		- More complex if the number of cases is large.
		- Requires more code than if-else statements for similar functionality.
* **If-Else Statement:**
	+ Pros:
		- More flexible and easier to maintain when there are many conditions or if logic changes frequently.
		- Can be faster in some scenarios (e.g., modern JavaScript engines might optimize the branching cost).
	+ Cons:
		- Involves a function call for each case, potentially increasing overhead compared to switch statements with known values.

**Alternatives**

Other alternatives that could have been tested in these benchmark cases include:

* `typeof` checks
* Conditional operators (`?:`)
* Loops (e.g., for loops)
* Other control structures

However, given the simplicity of the provided test cases and the focus on basic switch vs if-else comparison, these alternatives seem less relevant.

Related benchmarks:

switch vs if 2 (version: 0)

Comparing performance of: switch vs if

Created: 4 years ago by: Guest

Jump to the latest result

switch

if

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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