Benchmark: Spread vs push testq

Script Preparation code:

var arr1 = [1,2,3,4,5,6,7,8];
var arr2 = [10,11,1,34,56,7,3,23];

Tests:

Spread
var result = [...arr1, ...arr2];
Push
for (let index = 0; index < arr2.length; index++) { arr1.push(arr2[index]); }

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:

No previous 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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The benchmark is defined as a comparison between two approaches to concatenate arrays: using the spread operator (`...`) and using the `push()` method.

The script preparation code defines two arrays, `arr1` and `arr2`, which are used as input for the benchmark. The html preparation code is empty, indicating that no HTML code is involved in this benchmark.

**Benchmark Cases**

There are two individual test cases:

1. **Spread**: The benchmark definition uses the spread operator (`...`) to concatenate `arr1` and `arr2`. This approach creates a new array by copying elements from both arrays.
```javascript
var result = [...arr1, ...arr2];
```
2. **Push**: The benchmark definition uses the `push()` method to append elements from `arr2` to `arr1`, creating a new array at each step.

```javascript
for (let index = 0; index < arr2.length; index++) {
    arr1.push(arr2[index]);
}
```
**Pros and Cons of Each Approach**

**Spread Operator (`...`)**

Pros:

* More concise and readable code
* Creates a new array without modifying the original arrays
* Can be more efficient in some cases, as it avoids creating intermediate arrays

Cons:

* May require extra memory to create a new array
* Can be slower for very large datasets due to JavaScript's array copying mechanism

**Push Method**

Pros:

* More flexible and allows for dynamic array growth
* Can be faster for very large datasets, as elements are appended one by one

Cons:

* Requires explicit loop control and indexing
* May lead to stack overflows or performance issues if not implemented carefully

**Library: `Array.prototype.push()`**

The `push()` method is a part of the JavaScript Array prototype. It appends an element to the end of an array and returns the updated length.

```javascript
arr1.push(arr2[index]);
```
In this benchmark, we use `push()` to append elements from `arr2` to `arr1`, creating a new array at each step.

**Special JS Feature: None**

This benchmark does not involve any special JavaScript features or syntax. It is a straightforward comparison of two basic array concatenation approaches.

**Other Alternatives**

Other alternatives for concatenating arrays in JavaScript include:

* Using the `concat()` method, which returns a new array with all elements from both arrays.
```javascript
var result = arr1.concat(arr2);
```
* Using a library like Lodash or Ramda, which provide utility functions for working with arrays.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the spread operator and push method.

Related benchmarks:

Spread vs push testq (version: 0)

Comparing performance of: Spread vs Push

Created: 5 years ago by: Guest

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):