Benchmark: Js spread vs push vs concat

Tests:

Push
var params = [ "hello", true, 7 ]; params.push(1);
Spread
var params = [ "hello", true, 7 ] var other = [ ...params, 1 ]
Concat
var params = [ "hello", true, 7 ]; var other = params.concat([1])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Push
Spread
Concat

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, compared options, pros and cons, and other considerations.

**Benchmark Overview**

The test measures the performance of three different ways to add an element to an array in JavaScript:

1. `push()`
2. Spread operator (`...`)
3. `concat()` method

The test case provides a fixed array `params` with three initial elements: `"hello"`, `true`, and `7`. The goal is to determine which approach yields the best performance.

**Options Compared**

Here's a brief overview of each option:

### Push()

*   Method: `params.push(1)`
*   Description: This method adds an element to the end of the array.
*   Pros:
    *   Simple and widely supported
    *   Can be used with any type of data
*   Cons:
    *   May require re-assigning the entire array if needed
    *   Not as efficient as spread or concat for large arrays

### Spread Operator (`...`)

*   Method: `var other = [...params, 1]`
*   Description: This syntax creates a new array by spreading the existing array and appending the new element.
*   Pros:
    *   Efficient for large arrays
    *   Supports adding elements at any position in the array
    *   Can be used with destructuring assignment
*   Cons:
    *   Requires support for spread operator (not supported in older browsers)
    *   May have performance implications if not properly optimized

### Concat()

*   Method: `var other = params.concat([1])`
*   Description: This method creates a new array by concatenating the existing array with the specified element.
*   Pros:
    *   Efficient for large arrays
    *   Supports adding elements at any position in the array
    *   Works well with older browsers that support concat()
*   Cons:
    *   May create a temporary copy of the array, increasing memory usage

**Library and Special JS Features**

There are no libraries used in this benchmark. However, it's worth noting that the spread operator was introduced in ECMAScript 2015 (ES6) and may not be supported by older browsers.

**Alternative Approaches**

Other alternative approaches to adding an element to an array include:

*   Using `Array.prototype.set()`: This method allows setting a single value at a specific position in the array.
*   Using `Array.prototype.splice()`: This method replaces an element or elements with new values or other arrays.

However, these methods may have performance implications and are not as widely supported as the push(), spread, and concat() methods.

In conclusion, this benchmark measures the performance of three different approaches to adding an element to an array in JavaScript: `push()`, spread operator (`...`), and `concat()` method. The results can help developers choose the most efficient approach for their specific use cases.

Related benchmarks:

Js spread vs push vs concat (version: 0)

Comparing performance of: Push vs Spread vs Concat

Created: 7 years ago by: Guest

Jump to the latest result

Push

Spread

Concat

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):