Benchmark: JavaScript spread operator vs Object.assign performance123dsa

Tests:

Using the spread operator
const firstObject = ['Hello world'] const finalObject = [ ...firstObject, 'foo bar', ];
Using set
const firstObject = ['Hello world'] firstObject.push('foo bar')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using set

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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**Benchmark Definition**

The benchmark is testing two approaches for merging an array with another array:

1. Using the spread operator (`...`)
2. Using the `push` method to add elements to an array.

**Script Preparation Code and Html Preparation Code**

Since there's no script preparation code or HTML preparation code provided, we can assume that the benchmark script is a simple JavaScript snippet that defines the input arrays and performs the merge operation using each approach.

**Individual Test Cases**

The benchmark has two test cases:

1. "Using the spread operator":
```javascript
const firstObject = ['Hello world'];
const finalObject = [...firstObject, ' foo bar'];
```
This test case uses the spread operator (`...`) to create a new array by spreading the elements of `firstObject` into the new array.

2. "Using set":
```javascript
const firstObject = ['Hello world'];
firstObject.push('foo bar');
```
This test case pushes the element `'foo bar'` onto the end of the `firstObject` array using the `push` method.

**Options Compared**

The benchmark is comparing two options:

1. Using the spread operator (`...`)
2. Using the `push` method to add elements to an array

**Pros and Cons of Each Approach**

**Using the Spread Operator (`...`)**

Pros:

* More concise and readable code
* Allows for more flexible merging of arrays (e.g., merging objects, tuples, etc.)

Cons:

* May be slower than other approaches due to the overhead of creating a new array

**Using the `push` Method**

Pros:

* Typically faster than using the spread operator
* Widely supported and well-established method

Cons:

* Can lead to more verbose code
* Less flexible merging options compared to the spread operator

**Library Used (if any)**

None, as both test cases use built-in JavaScript features.

**Special JS Features or Syntax**

No special features or syntax are used in this benchmark. The focus is on comparing two simple array merging approaches.

**Other Alternatives**

If you're interested in exploring other ways to merge arrays, here are some alternative approaches:

* Using `Array.prototype.concat()`: `const finalObject = firstObject.concat(' foo bar');`
* Using `Array.prototype.unshift()`: `firstObject.unshift(' foo bar');` (Note: this method modifies the original array)
* Using a library like Lodash's `merge()` function: `const _ = require('lodash'); const finalObject = _.merge(firstObject, ['foo bar']);`

These alternatives may offer different trade-offs in terms of performance, code readability, and flexibility.

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/100.0.4896.60 Safari/537.36

Browser/OS: Chrome 100 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Using the spread operator	4170997.2 Ops/sec
Using set	33514256.0 Ops/sec

Related benchmarks:

JavaScript spread operator vs Object.assign performance123dsa (version: 0)

Comparing performance of: Using the spread operator vs Using set

Created: 2 years ago by: Registered User

Jump to the latest result

Using the spread operator

Using set

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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