Benchmark: spread vs push - simple

Script Preparation code:

const arr = [1,2,3,4,5];

Tests:

spread
const arr2 = [...[1,2,3,4,5], 6];
push
const arr2 = [1,2,3,4,5].push(6);

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:

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

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Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares the performance of two approaches: using the spread operator (`...`) to create a new array, and using the `push` method to add an element to an existing array. The benchmark is designed to test which approach is faster on modern browsers.

**Options Compared**

There are two options being compared:

1. **Spread Operator (`...`)**: This method creates a new array by spreading the elements of an existing array or object into a new array.
2. **`push` Method**: This method adds one or more elements to the end of an existing array and returns the length of the resulting array.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Spread Operator (`...`)**
	+ Pros:
		- Creates a new, independent array that can be modified without affecting the original array.
		- Can be more readable and intuitive for certain use cases (e.g., creating an array with multiple elements).
	+ Cons:
		- Requires the creation of a temporary array or object to store the spread elements.
		- May incur additional memory overhead.
* **`push` Method**
	+ Pros:
		- Modifies the original array in place, which can be more efficient in terms of memory allocation.
		- Can be faster for small arrays since it avoids creating a new array object.
	+ Cons:
		- Modifies the original array, which may not be desirable in certain situations (e.g., when preserving the original data).
		- May lead to slower performance if the array is large or frequently modified.

**Library and Purpose**

In the provided benchmark code, there are no explicit libraries being used. However, the `const arr = [1,2,3,4,5];` line creates a new array using the literal syntax, which is a built-in JavaScript feature.

**Special JS Feature or Syntax**

The `...` spread operator is a relatively recent addition to JavaScript (introduced in ECMAScript 2015) and provides a concise way to create arrays from existing arrays, objects, or iterables. It's used extensively in modern web development for array manipulation and creation.

**Other Alternatives**

If the spread operator is not available or desired, alternative methods for creating new arrays include:

* `Array.prototype.slice()`: Creates a shallow copy of an array using `slice()` method.
* `Array.prototype.concat()`: Concatenates one or more arrays together.
* Manual array creation: Using a `for` loop or `Array.from()` to create a new array from scratch.

Keep in mind that these alternatives may have different performance characteristics and use cases compared to the spread operator.

Related benchmarks:

spread vs push - simple (version: 0)

Comparing performance of: spread vs push

Created: 4 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):