Benchmark: Array concat vs spread operator vs push 123

Tests:

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

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Suite status: <idle, ready to run>

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

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Slowest: N/A

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

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**Overview of the Benchmark**

The MeasureThat.net website provides a platform for users to create and run JavaScript microbenchmarks. The provided benchmark compares the performance of three different approaches for adding elements to an array: the traditional `concat()` method, the spread operator (`...`), and the `push()` method.

**Test Cases**

There are three individual test cases:

1. **Array.prototype.concat**: This test case uses the traditional `concat()` method to concatenate two arrays.
2. **Spread Operator**: This test case uses the spread operator (`...`) to spread the elements of an array into a new array.
3. **Push**: This test case uses the `push()` method to add a single element to the end of an array.

**Options Compared**

The benchmark compares the performance of the three different approaches:

* **Traditional Concat Method (Array.prototype.concat)**: This approach creates a new array by concatenating two arrays using the `concat()` method.
* **Spread Operator**: This approach uses the spread operator (`...`) to spread the elements of an array into a new array.
* **Push Method**: This approach uses the `push()` method to add a single element to the end of an array.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Traditional Concat Method (Array.prototype.concat)**:
	+ Pros: Well-established and widely supported, easy to understand.
	+ Cons: Creates a new array, which can lead to increased memory usage and performance overhead.
* **Spread Operator**: 
	+ Pros: Modern and efficient way to create a new array from an existing one.
	+ Cons: May not work as expected in older browsers or with certain data types.
* **Push Method**:
	+ Pros: Fast and efficient, as it only adds a single element to the end of the array.
	+ Cons: Can be slower for larger arrays due to the need to re-index the elements.

**Library Usage**

None of the test cases use any external libraries. The benchmark focuses solely on comparing the performance of these three JavaScript built-in methods.

**Special JS Features/Syntax**

The spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for creating new arrays by spreading elements from an existing array into a new array.

**Alternatives**

If you need to add elements to an array, other alternatives could be:

* Using the `Array.prototype.push()` method with a loop: `arr.push(...newElements)`.
* Using the `Array.prototype.splice()` method with a negative index: `arr.splice(-1, 0, newElement)`.
* Using a library like Lodash's `_.union()` function.

However, these alternatives may not provide the same level of performance and efficiency as the three methods being compared in this benchmark.

Related benchmarks:

Array concat vs spread operator vs push 123 (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):