Benchmark: Add new element to array: push vs destructuring merging arrays

Tests:

spread operator
var params = [ "hello", true, 7 ] var items = ['world','new','foo','bar']; var other = [ ...params, ...items ]
Push
var params = [ "hello", true, 7 ]; var items = ['world','new','foo','bar']; for ( let i = 0; i < items.lenght; i++ ) { params.push(items[i]); }

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:

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

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I'll break down the benchmark definition and test cases for you.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark, where users can compare the performance of two different approaches: using the spread operator (`...`) to merge arrays and using the `push()` method to add elements to an array. The benchmark aims to measure which approach is faster.

**Options Compared**

1. **Spread Operator (Spreading Array)**: This approach uses the spread operator (`...`) to merge two arrays into a new array.
2. **Push Method**: This approach uses the `push()` method to add elements to an existing array.

**Pros and Cons of Each Approach**

* **Spread Operator (Spreading Array)**:
	+ Pros:
		- More concise and expressive code
		- Avoids mutating the original arrays
	+ Cons:
		- May have performance overhead due to creating a new array
		- Not supported in older browsers or environments
* **Push Method**:
	+ Pros:
		- Wide browser support
		- Fast and efficient for large arrays
	+ Cons:
		- Mutates the original array
		- Can lead to performance issues if not used carefully

**Library Used**

None mentioned in this specific benchmark. However, the use of `...` spread operator is a modern JavaScript feature that was introduced in ECMAScript 2015 (ES6).

**Special JS Feature or Syntax**

The spread operator (`...`) is a new syntax in JavaScript that allows for more concise and expressive array merging. It's a shorthand way to create a new array by concatenating multiple arrays.

**Benchmark Preparation Code and Test Cases**

The test cases provide two different approaches to merge two arrays: `push()` method vs spread operator. The benchmark definition code shows how the script can be set up to execute these two approaches.

In the first test case, "spread operator", the script uses the spread operator (`...`) to create a new array that combines the elements of both arrays. In the second test case, "Push", the script uses the `push()` method to add each element of one array to another.

**Other Alternatives**

Besides these two approaches, other methods can be used to merge arrays:

1. **Concatenation**: Using the `concat()` method to combine arrays.
```javascript
var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];
var mergedArr = arr1.concat(arr2);
```
2. **Array.prototype.reduce()**: Using the `reduce()` method to merge arrays.
```javascript
var arr1 = [1, 2, 3];
var arr2 = [4, 5, 6];
var mergedArr = arr1.reduce((acc, curr) => acc.concat([curr]), []);
```
These alternatives may have different performance characteristics and use cases compared to the spread operator or `push()` method.

Related benchmarks:

Add new element to array: push vs destructuring merging arrays (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

No previous run results

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