Benchmark: Array concat vs spread operator vs push (es6)

Tests:

Array.prototype.concat
let arr = [1]; arr = arr.concat([2]);
spread operator
let arr = [1]; arr = [...arr, 2];
Push
let arr = [1]; arr.push(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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Let's break down the benchmark and its test cases.

**Benchmark Definition**

The provided JSON defines a benchmark that compares three approaches to concatenate or append elements to an array in JavaScript:

1. `Array.prototype.concat()`: The traditional method of concatenating arrays using the `concat()` method.
2. Spread Operator (`...arr`): The new ES6 spread operator, introduced in ECMAScript 2015, which allows for concise array creation and manipulation.
3. `push()` method: The `push()` method is used to add one or more elements to the end of an array.

**Test Cases**

There are three individual test cases:

1. `Array.prototype.concat`: This test case uses the traditional `concat()` method to concatenate two arrays, `[1]` and `[2]`.
2. Spread Operator: This test case uses the spread operator (`...arr`) to create a new array by concatenating `[1]` and `[2]`.
3. `push()`: This test case uses the `push()` method to append the element `2` to the end of an array initialized with `[1]`.

**Options Compared**

The benchmark compares the performance of these three approaches:

* **Pros and Cons:**
	+ `Array.prototype.concat()`: Pros - widely supported, easy to use. Cons - can be slow for large arrays due to the overhead of creating a new array.
	+ Spread Operator (`...arr`): Pros - concise, efficient, and modern syntax. Cons - may not be supported in older browsers or environments.
	+ `push()`: Pros - simple, efficient, and widely supported. Cons - may not be as concise or readable as the spread operator.
* **Other Considerations:**
	+ The benchmark does not consider other array concatenation methods, such as `slice().concat()` or using a loop.
	+ It also doesn't account for the impact of array length on performance.

**Library**

None of the test cases uses any libraries. They are self-contained JavaScript code snippets that demonstrate the three different approaches to array concatenation.

**Special JS Features or Syntax**

The only special syntax used is the spread operator (`...arr`), which was introduced in ECMAScript 2015.

**Alternatives**

If you're interested in exploring alternative approaches, consider the following:

* `slice().concat()`: This method creates a shallow copy of the original array using `slice()` and then concatenates it with another array.
* Using a loop: You can use a traditional `for` loop or `forEach()` to iterate over an array and append elements.

These alternatives may not provide the same concise syntax as the spread operator, but they can offer more control and flexibility in certain scenarios.

Related benchmarks:

Array concat vs spread operator vs push (es6) (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):