Benchmark: spread v push - MeasureThat.net

Tests:

push
const foo = ['j', 'o', 'r', 'd', 'a']; foo.push('n');
spread
const foo = ['j', 'o', 'r', 'd', 'a']; [...foo, 'n'];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
spread

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.

Measuring JavaScript performance is crucial for web developers and browser vendors alike. Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark definition is represented by the JSON object:
```json
{
  "Name": "spread v push",
  "Description": null,
  "Script Preparation Code": null,
  "Html Preparation Code": null
}
```
This benchmark defines two test cases: `push` and `spread`. The script preparation code for both tests is empty, which means that the script only contains the actual performance measurement code.

**Test Cases**

The individual test cases are defined as an array of objects:
```json
[
  {
    "Benchmark Definition": "const foo = ['j', 'o', 'r', 'd', 'a'];\r\nfoo.push('n');",
    "Test Name": "push"
  },
  {
    "Benchmark Definition": "const foo = ['j', 'o', 'r', 'd', 'a'];\r\n[...foo, 'n'];",
    "Test Name": "spread"
  }
]
```
These test cases create an array `foo` with five elements and then perform two different operations:

1. `push`: The script uses the `push()` method to add a new element `'n'` to the end of the array.
2. `spread`: The script uses the spread operator (`[...foo, 'n']`) to create a new array by concatenating the original array with the string `'n'`.

**Library and Special JS Features**

Both test cases use built-in JavaScript features:

* `push()` method: This is a standard array method that appends an element to the end of an array.
* Spread operator (`[...foo, 'n']`): This feature was introduced in ECMAScript 2015 (ES6) and allows for creating new arrays by spreading an existing array.

**Options Comparison**

The main difference between `push()` and spread operator is how they affect memory allocation and performance:

1. `push()`: When you use `push()` to add an element to the end of an array, it allocates a new block of memory to store the additional element. This can lead to more memory fragmentation and potentially slower performance for large arrays.
2. Spread operator: The spread operator creates a new array by copying elements from the original array. While this also requires some memory allocation, it tends to be more efficient than `push()` because it avoids unnecessary copy operations.

**Pros and Cons**

Here are some pros and cons of each approach:

* `push()`:
	+ Pros: Easy to use, straightforward.
	+ Cons: Can lead to slower performance for large arrays due to memory allocation.
* Spread operator:
	+ Pros: More efficient than `push()` for large arrays, creates a new array with minimal overhead.
	+ Cons: Requires modern JavaScript versions (ES6+) and can be less intuitive for some developers.

**Alternatives**

If you're interested in exploring alternative approaches or variations on these tests, here are a few suggestions:

* Using other data structures like `Set` or `Map` instead of arrays.
* Adding more elements to the array using `concat()` method.
* Implementing custom memory management algorithms for efficient allocation.

However, keep in mind that the spread operator is now a standard feature in modern JavaScript, making it an attractive choice for performance comparisons.

Related benchmarks:

spread v push (version: 0)

Comparing performance of: push vs spread

Created: 4 years ago by: Guest

Jump to the latest result

push

spread

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):