Benchmark: Array concat vs spread operator vs push (tom s)

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = params.concat(1, 2 )
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params, 1, 2]
Push
var params = [ "hello", true, 7 ]; var other = params.push(1, 2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

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

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**Overview**

The provided benchmark measures the performance of three different approaches to concatenate arrays in JavaScript:

1. `Array.prototype.concat()`
2. The spread operator (`...`)
3. `Array.prototype.push()` with multiple arguments

These methods are compared across various browsers and devices.

**Benchmark Definition**

The benchmark definition describes the scope of the test, including the script preparation code, HTML preparation code (which is null in this case), and a description of the test.

**Individual Test Cases**

Each test case represents a specific implementation of array concatenation. The three test cases are:

1. `Array.prototype.concat()`: This method concatenates an existing array with another array or value using the `concat()` method.
2. Spread Operator (`...`): This syntax creates a new array by spreading the elements of an existing array and adding one or more additional arguments.
3. `Array.prototype.push()` with multiple arguments: This method adds multiple values to the end of an array using the `push()` method.

**Options Compared**

The benchmark compares the performance of these three approaches:

* **Approach 1: `Array.prototype.concat()`**: Concatenates two arrays using the `concat()` method.
* **Approach 2: Spread Operator (`...`)**: Creates a new array by spreading an existing array and adding one or more additional arguments.
* **Approach 3: `Array.prototype.push()` with multiple arguments**: Adds multiple values to the end of an array using the `push()` method.

**Pros and Cons**

Here are some pros and cons for each approach:

* **`Array.prototype.concat()`**:
	+ Pros: Widely supported, easy to use.
	+ Cons: Can be slower than spread operator or push with multiple arguments.
* **Spread Operator (`...`)**:
	+ Pros: Fast, modern syntax.
	+ Cons: May not work in older browsers or environments that don't support it.
* **`Array.prototype.push()` with multiple arguments**:
	+ Pros: Can be faster for large arrays, easy to use.
	+ Cons: May not work as expected if array is full or if push method is called recursively.

**Library and Special JS Features**

In this benchmark, there are no libraries used. However, it's worth noting that some browsers may implement certain features or polyfills for older browsers that don't support the spread operator.

There are no special JavaScript features used in this benchmark beyond what's commonly available in modern browsers.

**Other Considerations**

When choosing an array concatenation method, consider the following factors:

* **Browser Support**: If you need to support very old browsers, `Array.prototype.concat()` might be a safer choice.
* **Performance**: If speed is critical, the spread operator or push with multiple arguments might be better options for large arrays.
* **Readability and Maintainability**: The spread operator's syntax can make code easier to read and maintain.

**Alternatives**

If you're looking for alternative array concatenation methods, consider:

* **`Array.prototype.slice()` followed by `concat()`**: This approach is slightly slower than the spread operator but still faster than push with multiple arguments.
* **Using a library like Lodash**: Lodash provides a `concat` function that can be used to concatenate arrays in a more functional programming style.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the methods tested in this benchmark.

Related benchmarks:

Array concat vs spread operator vs push (tom s) (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: Array.prototype.concat vs spread operator vs Push

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

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):