Benchmark: Test push - MeasureThat.net

Script Preparation code:

var arr = ['1', '2', '3', '4', '5', '6', '7', '8', '9']

Tests:

Spread
var copy = [...arr]
push
var copy = []; for(var len = arr.length, i = 0; i < arr.length; i++){ copy.push(arr[i]) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
push

Fastest: N/A

Slowest: N/A

Latest 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 what's being tested in this benchmark.

**Benchmark Definition**

The first part of the benchmark defines the test itself: `var arr = ['1', '2', '3', '4', '5', '6', '7', '8', '9']`. This code creates an array of 9 numbers. The "Script Preparation Code" section is the same as this, which means that before any tests are run, a global `arr` variable is created and populated with these values.

**Individual Test Cases**

There are two test cases:

1. **Spread**: This test case uses the spread operator (`...`) to create a copy of the original array: `var copy = [...arr]`. The purpose of this test is likely to measure how fast JavaScript can create a shallow copy of an array using this syntax.
2. **push**: This test case uses a loop to push each element of the original array onto a new array: `for(var len = arr.length, i = 0; i < arr.length; i++){\r\n\tcopy.push(arr[i])\r\n}`. The purpose of this test is likely to measure how fast JavaScript can create an array by appending elements one by one.

**Pros and Cons**

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

* **Spread Operator (Spread)**:
	+ Pros: Fast, efficient, and modern syntax.
	+ Cons: May not work as expected if the original array is mutated elsewhere in the codebase.
* **push**: 
	+ Pros: Works with any array type, can be more memory-efficient for large datasets.
	+ Cons: Can be slower due to the overhead of pushing elements one by one.

**Library**

None of the tests use a library explicitly. However, it's worth noting that JavaScript arrays are built on top of the ECMAScript Standard Library, which is maintained by the Ecma International standards organization.

**Special JS Feature/Syntax**

The `...` spread operator and template literals (e.g., `var copy = [...arr]`) were introduced in ECMAScript 2015 (ES6) as part of the JavaScript standard. These features are widely supported across modern browsers and platforms.

**Other Alternatives**

If you wanted to create an array by appending elements, you could use other methods like:

* `Array.prototype.concat()`: `var copy = arr.concat();`
* `Array.prototype.slice()`: `var copy = arr.slice();` (though this would create a new array with a reference to the original array's length)

Keep in mind that the performance differences between these approaches can be small and may depend on specific use cases and code optimizations.

**Benchmark Considerations**

When running benchmarks like this, it's essential to consider factors such as:

* **Test data size**: How large is the input dataset? Larger datasets may lead to more significant performance differences.
* **Platform and browser variations**: Are you testing across different operating systems, browsers, or versions?
* **Warm-up time**: Does your benchmark take into account the time it takes for JavaScript engines to warm up and reach optimal performance?

By understanding these factors, you can create more robust and meaningful benchmarks that accurately reflect real-world scenarios.

Related benchmarks:

Test push (version: 0)

Comparing performance of: Spread vs push

Created: 4 years ago by: Registered User

Jump to the latest result

Spread

push

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):