Benchmark: Add new element to array: push vs destructuring vs directly assign

Tests:

spread operator
var params = [ "hello", true, 7 ] params = [ ...params, 'new' ]
Push
var params = [ "hello", true, 7 ]; params.push('new');
Assign
var params = [ "hello", true, 7 ]; params[3] ='new';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Push
Assign

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Chrome OS 14541.0.0

View result in a separate tab

Test name	Executions per second
spread operator	15358222.0 Ops/sec
Push	23479402.0 Ops/sec
Assign	21305646.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided JSON represents a benchmark with three test cases:

1. `Add new element to array: push vs destructuring vs directly assign`
2. `spread operator`
3. `Push`
4. `Assign`

The benchmark definition suggests that the goal is to compare the performance of three approaches for adding a new element to an array:

* Using the `push` method
* Using destructuring assignment (`...params, 'new'`)
* Directly assigning a value to an array index (`params[3] = 'new'`)

**Options Compared**

The benchmark compares the following options:

1. **Destructuring assignment**: Using the spread operator (`...params`) to create a new array with the existing elements and the newly added element.
2. **Push method**: Using the `push` method to add a new element to the end of the array.
3. **Direct assignment**: Assigning a value directly to an array index.

**Pros and Cons**

Here's a brief summary of each approach:

1. **Destructuring assignment**:
	* Pros: Can be more concise and expressive, especially when working with complex data structures.
	* Cons: May incur additional overhead due to the creation of a new array.
2. **Push method**:
	* Pros: Simple and widely supported, making it easy to use in most JavaScript environments.
	* Cons: May involve additional iterations over the array, which can be slower than other approaches.
3. **Direct assignment**:
	* Pros: Fast and efficient, as it directly modifies the existing array.
	* Cons: Can be less readable and more prone to errors, especially when dealing with complex data structures.

**Library and Special Features**

None of the benchmark test cases use any specific JavaScript libraries or special features like `async/await`, `let`, or `const` (except for the general syntax differences between modern browsers).

**Alternative Approaches**

If you're interested in exploring other approaches, here are a few alternatives:

* **Using `Array.prototype.concat()`**: This method can be used to concatenate arrays, but it may not be as efficient as using the spread operator or push method.
* **Using `Array.prototype.slice()` and assignment**: Another way to add an element to an array is by creating a new array using `slice()` and assigning it back to the original array.

In summary, the benchmark on MeasureThat.net provides a helpful comparison of three approaches for adding elements to an array in JavaScript. By understanding the pros and cons of each approach, developers can make informed decisions about which method to use depending on their specific requirements and performance considerations.

Related benchmarks:

Add new element to array: push vs destructuring vs directly assign (version: 0)

Comparing performance of: spread operator vs Push vs Assign

Created: 2 years ago by: Guest

Jump to the latest result

spread operator

Push

Assign

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):