Benchmark: Push vs assignment

Tests:

Push
let viewport = []; viewport.push(1,2);
Assign
let viewport = []; viewport = [1,2]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Push
Assign

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Android 14; Mobile; rv:137.0) Gecko/137.0 Firefox/137.0

Browser/OS: Firefox Mobile 137 on Android

View result in a separate tab

Test name	Executions per second
Push	23012410.0 Ops/sec
Assign	842619328.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The provided JSON represents a benchmark definition with two test cases: "Push" and "Assign". The script preparation code is empty, which means that the benchmark uses only the JavaScript engine's built-in features. There's no special JS feature or syntax mentioned, so we'll focus on more general aspects.

**Options Compared**

In this benchmark, two options are being compared:

1. **Assignment vs Push**: In the "Assign" test case, a new array is assigned to the `viewport` variable using the assignment operator (`=`). In contrast, the "Push" test case uses the `push()` method to add elements to the existing array.
2. **Null vs undefined**: Although not explicitly mentioned in the benchmark definition, we can infer that there might be another option being compared: using a null or undefined value instead of an actual value for the push operation.

**Pros and Cons of Each Approach**

1. **Assignment (Assign)**:
	* Pros:
		+ Can be faster since it avoids creating a new array object.
		+ May have better cache locality due to the assignment operator's behavior.
	* Cons:
		+ Creates a new array object, which can lead to increased memory allocation and garbage collection overhead.
2. **Push**:
	* Pros:
		+ Creates a new array object only when necessary (when `push()` is called), avoiding unnecessary allocations.
		+ Can be more efficient for large arrays since it avoids creating a new object reference.
	* Cons:
		+ May have slower performance due to the overhead of method calls and checking if the array is empty.

**Library Considerations**

There's no library mentioned in the benchmark definition, which suggests that the tests are designed to measure only JavaScript engine-specific optimizations. However, it's worth noting that some libraries might provide optimized implementations for arrays or other data structures, which could affect the results of this benchmark.

**Special JS Features/Syntax (None)**

Since there's no special JS feature or syntax mentioned in the benchmark definition, we can assume that these tests are designed to measure general JavaScript engine optimizations.

**Other Alternatives**

To create similar benchmarks, you could consider adding more test cases, such as:

* Using different data types (e.g., numbers, strings, objects) instead of arrays.
* Comparing other array operations, like `slice()`, `concat()`, or `forEach()`.
* Including more browsers or devices to test the benchmark on.

For example, you could add a new benchmark definition:
```json
{
    "Name": "Array Slice",
    "Description": null,
    "Script Preparation Code": null,
    "Html Preparation Code": null
}
```
And a corresponding test case:
```json
[
    {
        "Benchmark Definition": "let viewport = [1,2,3];\r\nviewport.slice(1);",
        "Test Name": "Slice"
    }
]
```
This would allow you to compare the performance of different array operations in various scenarios.

Related benchmarks:

Push vs assignment (version: 0)

Comparing performance of: Push vs Assign

Created: 6 years ago by: Guest

Jump to the latest result

Push

Assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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