Benchmark: Test floor - MeasureThat.net

Tests:

w/ var
function x(z){var fz = Math.floor(z); return [2<<fz, 1<<fz];}; var test0 = x(21.123456789123);
w/o var
function y(z){return [2<<Math.floor(z), 1<<Math.floor(z)];}; var test1 = y(21.123456789123);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
w/ var
w/o var

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark is designed to measure the performance of JavaScript code in various scenarios. Specifically, it tests the execution speed of two different approaches: using `var` and not using `var` (also known as "let" or "const").

**What's being tested?**

In each test case, a simple function is defined that takes a number `z` as input, performs some arithmetic operations on it, and returns an array with two values. The arithmetic operation involves shifting the bits of `z` using the left shift operator (`<<`). The test cases compare the performance of these functions in different browsers.

**Options compared**

The benchmark tests two main options:

1. **Using `var`**: This option uses the old-style variable declaration syntax, where `z` is declared with `var`. This means that `z` is a global variable and can be accessed from anywhere in the code.
2. **Not using `var` (let or const)**: This option uses the new-style variable declaration syntax, where `z` is declared with `const`. This means that `z` is a constant variable and cannot be reassigned.

**Pros and Cons of each approach**

1. **Using `var`**:
	* Pros: Widely supported in older browsers and versions.
	* Cons: Can lead to unexpected behavior due to scope and hoisting issues.
2. **Not using `var` (let or const)**:
	* Pros: More predictable behavior, better support for block scoping, and no hoisting issues.
	* Cons: Requires support for newer JavaScript features, which might not be available in older browsers.

**Library usage**

There is no explicit library mentioned in the benchmark definition. However, it's possible that some internal libraries or frameworks are used to create the test cases.

**Special JS feature/syntax**

The benchmark uses a special syntax for testing the `const` keyword: `const fz = Math.floor(z);`. This syntax is used to declare a constant variable `fz` and initialize its value with the result of `Math.floor(z)`. The use of `const` ensures that the variable `fz` is not reassigned, which can help prevent unexpected behavior.

**Other alternatives**

If you're interested in testing other JavaScript features or scenarios, here are some alternative approaches:

* Test the performance of different data structures (e.g., arrays, objects, sets).
* Compare the performance of different algorithms for common tasks (e.g., sorting, searching, encryption).
* Test the performance of browser-specific APIs (e.g., Web Storage, Web Workers, Geolocation).
* Create benchmarking scripts using frameworks like Benchmark.js or JSPerf.

Keep in mind that writing effective benchmarks requires careful consideration of factors like hardware and software environment, test case complexity, and statistical significance.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser/OS: Chrome 105 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
w/ var	4621847.0 Ops/sec
w/o var	2581938.2 Ops/sec

Related benchmarks:

Test floor (version: 0)

Comparing performance of: w/ var vs w/o var

Created: 2 years ago by: Guest

Jump to the latest result

w/ var

w/o var

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):