Benchmark: Add new element to array: push vs destructuring multiple entries

Tests:

spread operator
var params = [ "hello", true, 7 ] var params = [ ...params, 'new' ] var params = [ ...params, 'new' ] var params = [ ...params, 'new' ] var params = [ ...params, 'new' ] var params = [ ...params, 'new' ] var params = [ ...params, 'new' ] var params = [ ...params, 'new' ]
Push
var params = [ "hello", true, 7 ]; params.push('new'); params.push('new'); params.push('new'); params.push('new'); params.push('new'); params.push('new'); params.push('new');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Push

Fastest: N/A

Slowest: N/A

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/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spread operator	8735712.0 Ops/sec
Push	13323293.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking setup.

**Benchmark Overview**

The benchmark compares two approaches for adding a new element to an array:

1. Using the spread operator (`...`).
2. Using the `push()` method.

**Spread Operator Approach**

The first test case uses the spread operator approach:
```javascript
var params = [ "hello", true, 7 ];
var params = [ ...params, 'new' ];
var params = [ ...params, 'new' ];
var params = [ ...params, 'new' ];
var params = [ ...params, 'new' ];
var params = [ ...params, 'new' ];
var params = [ ...params, 'new' ];
var params = [ ...params, 'new' ];
```
The spread operator (`...`) is used to create a new array by copying the existing `params` array and adding each of the specified elements.

**Push Method Approach**

The second test case uses the `push()` method approach:
```javascript
var params = [ "hello", true, 7 ];
params.push('new');
params.push('new');
params.push('new');
params.push('new');
params.push('new');
params.push('new');
params.push('new');
```
This approach modifies the existing `params` array by adding each of the specified elements using the `push()` method.

**Comparison and Considerations**

Both approaches have their pros and cons:

* **Spread Operator Approach:**
	+ Pros:
		- Efficient in modern browsers, as it uses a single operation to add multiple elements.
		- Less memory allocation than creating a new array and then pushing elements into it.
	+ Cons:
		- Requires JavaScript 2015+ syntax (ES6+).
		- Can be slower due to additional overhead of parsing the spread operator expression.
* **Push Method Approach:**
	+ Pros:
		- Older browsers may have better performance, as they can optimize this simple push operation.
		- Easier to understand and implement for beginners.
	+ Cons:
		- Requires multiple `push()` calls, which can lead to slower execution times.

**Library Usage**

None of the test cases explicitly use a library. However, modern browsers like Safari 17 have built-in optimizations that can affect the performance of these benchmarking tests.

**Special JS Features or Syntax**

The spread operator approach relies on JavaScript's ES6+ syntax (`...`). This syntax was introduced in 2015 and is widely supported in modern browsers.

**Other Alternatives**

To test similar benchmarks, you could consider adding additional test cases with different approaches, such as:

* Using `concat()` instead of the spread operator.
* Modifying an existing array using a loop or other methods (e.g., `Array.prototype.forEach`).
* Testing the performance of array literals versus dynamic array creation.

Keep in mind that benchmarking should focus on real-world use cases and optimization techniques. These suggestions can help you create more comprehensive benchmarks by exploring different approaches and techniques.

Related benchmarks:

Add new element to array: push vs destructuring multiple entries (version: 0)

Comparing performance of: spread operator vs Push

Created: 4 years ago by: Guest

Jump to the latest result

spread operator

Push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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