Benchmark: Add new element to large array: push vs destructuring vs bracket access

Tests:

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

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 dive into explaining the provided benchmark.

**Benchmark Overview**

The benchmark compares three different approaches for adding a new element to a large array in JavaScript:

1. **Push**: Using the `push` method to add an element at the end of the array.
2. **Destructuring Spread Operator (`...`)**: Using the spread operator to create a new array with the original array elements and the additional element.
3. **Bracket Access**: Using bracket notation (e.g., `params[params.length]`) to access the last index of the array and add an element.

**Options Compared**

The benchmark compares these three approaches for several reasons:

* **Performance**: Each approach has a different performance profile, which is reflected in the "ExecutionsPerSecond" value. The highest execution rate indicates the fastest method.
* **Readability and Maintainability**: While not directly measured, readability and maintainability are implicit considerations. For example, using the `push` method might be considered more readable than bracket notation or the spread operator.

**Pros and Cons of Each Approach**

1. **Push**:
	* Pros: Simple, widely supported, and easy to read.
	* Cons: Can lead to memory fragmentation if not managed carefully (e.g., with `Array.prototype.push` calls in a loop).
2. **Destructuring Spread Operator (`...`)**:
	* Pros: More concise and expressive than bracket notation or `push`.
	* Cons: Requires modern JavaScript features (ECMAScript 2015+) and might be slower due to the overhead of creating a new array.
3. **Bracket Access**:
	* Pros: Fast, as it directly accesses the last index without creating a new array.
	* Cons: Less readable and less maintainable than the other two approaches.

**Library Usage**

None of the benchmark cases explicitly use any JavaScript libraries or frameworks beyond the standard `Array` prototype methods (e.g., `push`, `length`).

**Special JS Features/Syntax**

The spread operator (`...`) is a feature introduced in ECMAScript 2015+, which allows creating a new array by spreading elements from an existing array. While most modern browsers support this feature, it may not be supported in older browsers or environments.

**Alternatives**

Other approaches to add an element to a large array include:

* **Using `concat()`**: `params.concat('new')`. This method creates a new array and returns it, which can lead to slower performance compared to the other two approaches.
* **Using `Array.prototype.forEach()` with `push`**: This approach is similar to using `push` but involves more overhead due to the callback function.

In summary, the benchmark compares three approaches for adding an element to a large array in JavaScript: `push`, destructuring spread operator (`...`), and bracket access. Each approach has its pros and cons, and understanding these trade-offs can help developers choose the best method for their specific use case.

Related benchmarks:

Add new element to large array: push vs destructuring vs bracket access (version: 0)

Comparing performance of: spread operator vs Push vs bracket access

Created: 3 years ago by: Guest

Jump to the latest result

spread operator

Push

bracket access

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):