Benchmark: Add new element to array: push vs destructuring vs indices

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Push
indices

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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Let's break down the benchmark and its individual test cases to understand what is being tested.

**Benchmark Definition**

The provided JSON defines a benchmark named "Add new element to array: push vs destructuring vs indices". This benchmark compares three different approaches for adding a new element to an array in JavaScript:

1. **Push**: Using the `push()` method to add an element at the end of the array.
2. **Destructuring**: Using the spread operator (`...`) to create a new array with the existing elements and the new element added at the end.
3. **Indices**: Accessing the last index of the array and assigning the new value to that location.

**Options Compared**

The three options being compared are:

* **Push**: The most traditional way to add an element to the end of an array.
* **Destructuring**: A more modern approach using the spread operator, which can be more efficient and concise in some cases.
* **Indices**: An older method that uses indexing to access the last element and assign a new value.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Push**:
	+ Pros: Easy to understand, widely supported, and relatively fast.
	+ Cons: May incur additional memory allocation or copying when adding elements at the end of the array.
* **Destructuring**:
	+ Pros: Can be more efficient and concise, especially for large arrays. Also, it avoids creating a new array and instead modifies the existing one in place.
	+ Cons: Requires support for spread operator, which might not be present in older browsers or Node.js versions.
* **Indices**:
	+ Pros: No additional memory allocation or copying required, as it directly accesses the last element of the array.
	+ Cons: Less intuitive and less concise than the `push` method, may require more explicit indexing.

**Library Usage**

None of the individual test cases use any libraries. They rely solely on built-in JavaScript features to perform their operations.

**Special JS Features or Syntax**

The benchmark uses the spread operator (`...`) in one of the test cases, which is a modern feature introduced in ECMAScript 2015 (ES6). This allows for more concise and expressive code when working with arrays. The other two test cases use traditional indexing methods.

**Other Alternatives**

There might be additional approaches to adding elements to an array in JavaScript, such as using `unshift()` or `concat()`, but they are not explicitly mentioned in the benchmark definition provided.

Overall, this benchmark aims to compare the performance of three different approaches for adding an element to an array in JavaScript: traditional `push` method, modern spread operator-based approach, and older indexing-based method.

Related benchmarks:

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

Comparing performance of: spread operator vs Push vs indices

Created: 3 years ago by: Guest

Jump to the latest result

spread operator

Push

indices

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):