Benchmark: Switch vs. If - MeasureThat.net

Script Preparation code:

var random = Math.floor(Math.random() * 20);

Tests:

Switch
switch (random) { case 0: random = -Math.PI; break; case 1: random = Math.EPSILON; break; case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: random = 1; break; case 10: case 11: case 12: random /= 5; break; case 13: case 14: case 15: case 16: case 17: random **= 2; break; case 18: random = 5; break; case 19: random = 28; break; case 20: random = 0; break; default: random = -1; break; }
If
if (random === 0) random = -Math.PI; else if (random === 1) random = Math.EPSILON; else if (random < 10) random = 1; else if (random < 13) random /= 5; else if (random < 18) random **= 2; else if (random === 18) random = 5; else if (random === 19) random = 28; else if (random === 20) random = 0; else random = -1;

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

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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 and explain what's being tested.

**Benchmark Definition**

The benchmark is defined in JSON format, which includes two main sections:

1. **Script Preparation Code**: This section contains a JavaScript code snippet that generates a random number between 0 and 20 using `Math.floor(Math.random() * 20)`. The purpose of this code is to initialize the random variable used throughout the benchmark.
2. **Html Preparation Code**: This section is empty, which means no additional HTML code is generated for the benchmark.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Switch**
	* The `Benchmark Definition` uses a `switch` statement to perform different operations on the random variable based on its value.
	* For example, when the random value is between 0 and 9, it sets the variable to 1; when the random value is between 10 and 12, it divides the variable by 5; and so on.
2. **If**
	* The `Benchmark Definition` uses an `if-else` chain to perform different operations on the random variable based on its value.
	* For example, if the random value is 0, it sets the variable to -π; if the random value is 1, it sets the variable to ε; and so on.

**Options Compared**

The two test cases are comparing the performance of `switch` statements versus `if-else` chains. The benchmark aims to determine which approach is faster for this specific set of operations.

**Pros and Cons**

Here's a brief analysis of the pros and cons of each approach:

* **Switch**
	+ Pros:
		- Can be more concise and easier to read when dealing with multiple, distinct cases.
		- Can be faster because the compiler can optimize it better.
	+ Cons:
		- May not work well for cases that don't fit neatly into a switch statement (e.g., ranges like 10-12).
* **If-Else Chain**
	+ Pros:
		- Works well for any range or case, including non-distinct ones.
	+ Cons:
		- Can be less concise and harder to read due to the nested structure.

**Special Considerations**

In this benchmark, no special JavaScript features or syntax are used beyond what's commonly found in modern browsers. However, some older versions of Internet Explorer might not support `switch` statements as efficiently.

**Other Alternatives**

There are other alternatives for handling different cases, such as:

* **Object-based approach**: Using objects with properties corresponding to the different cases.
* **Arrays-based approach**: Using arrays and iterating over them to find a match.
* **Regex-based approach**: Using regular expressions to match against the random value.

These alternatives might not be as concise or efficient as `switch` statements or `if-else` chains, but they can provide an alternative perspective on how to handle different cases.

Related benchmarks:

Switch vs. If (version: 0)

Comparing performance of: Switch vs If

Created: 5 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):