Benchmark: test nulling object and overwriting vs overwriting

Script Preparation code:

let a = 99;

Tests:

1
for(let i = 0; i<1000; i++) { a = null; a = 99; a = 1; }
2
for(let i = 0; i<1000; i++) { a = 99; a = 1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

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/119.0.0.0 Safari/537.36 OPR/105.0.0.0

Browser/OS: Opera 105 on Windows

View result in a separate tab

Test name	Executions per second
1	5965.8 Ops/sec
2	8955.8 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON for MeasureThat.net, explaining what's being tested and comparing different approaches.

**Benchmark Definition**

The benchmark definition is an object with the following properties:

* `Name`: The name of the benchmark, which is "test nulling object and overwriting vs overwriting".
* `Description`: An empty string, indicating that no description was provided.
* `Script Preparation Code`: A JavaScript code snippet that initializes a variable `a` to 99. This code is executed before running the benchmark.
* `Html Preparation Code`: An empty string, indicating that no HTML preparation code was needed.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Test Case 1**: The benchmark definition is a `for` loop that runs 1000 times, where:
	* Inside the loop, `a` is first set to `null`.
	* Then, `a` is reassigned to 99.
	* Finally, `a` is assigned the value 1.
2. **Test Case 2**: The benchmark definition is another `for` loop that runs 1000 times, where:
	* Inside the loop, `a` is first set to 99.
	* Then, `a` is reassigned to 1.

**Comparison of Approaches**

The two test cases compare the performance differences between:

1. **Nulling out a variable**: In Test Case 1, `a` is first set to `null`, and then reassigned to 99 before being assigned 1. This approach can lead to slower execution due to the garbage collection process.
2. **Overwriting without nulling**: In Test Case 2, `a` is directly reassigned from 99 to 1 without going through a null state.

**Pros and Cons**

* Nulling out a variable (Test Case 1):
	+ Pros: Avoids potential issues with garbage collection and caching.
	+ Cons: May introduce additional overhead due to the null assignment.
* Overwriting without nulling (Test Case 2):
	+ Pros: Often faster execution, as it avoids the need for garbage collection.
	+ Cons: May lead to issues if the variable is accessed after being overwritten.

**Library and Special JavaScript Features**

There are no libraries mentioned in the benchmark definition. However, the `for` loop syntax is a standard feature of JavaScript, and there are no special features or syntax used in this benchmark.

**Other Alternatives**

Alternative approaches for this benchmark could include:

* Using different data structures, such as an array or object, instead of a single variable.
* Adding additional operations to each test case, such as concatenating strings or performing arithmetic calculations.
* Using different browsers or devices with varying performance characteristics.
* Experimenting with optimized JavaScript code or compilers.

Overall, this benchmark is designed to evaluate the performance differences between two specific approaches to overwriting a variable: nulling it out versus directly assigning a new value without going through a null state.

Related benchmarks:

test nulling object and overwriting vs overwriting (version: 0)

Comparing performance of: 1 vs 2

Created: 2 years ago by: Guest

Jump to the latest result

1

2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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