Benchmark: Array concat vs spread operator vs push for single arg

Tests:

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

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

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents a benchmark test that compares three approaches to concatenate or add an element to an array: the traditional `concat()` method, the new ES6 spread operator (`...`), and the `push()` method.

Here's what each option tests:

1. **Array.prototype.concat**: This method creates a new array by concatenating two or more arrays.
2. **Spread Operator ( ... )**: This is a new syntax introduced in ES6 that allows you to spread an array's elements into a new array, effectively creating a copy of the original array and adding new elements.
3. **Array.prototype.push**: This method adds one or more elements to the end of an array.

**Comparison Options:**

The benchmark compares these three options against each other in terms of performance (executions per second).

**Pros and Cons of Each Approach:**

1. **Array.prototype.concat**:
	* Pros: widely supported, easy to read, and understand.
	* Cons: creates a new array, which can be memory-intensive for large arrays.
2. **Spread Operator ( ... )**:
	* Pros: concise, readable, and efficient, as it only creates a shallow copy of the original array.
	* Cons: relatively new syntax, may require more time to learn and understand.
3. **Array.prototype.push**:
	* Pros: simple, widely supported, and memory-efficient, as it modifies the existing array in place.
	* Cons: can be slower than `concat` or spread operator for large arrays.

Other considerations:

* The benchmark uses a single-element array (`[1]`) to add to each of the three options. This might not accurately reflect real-world scenarios where you're adding multiple elements or dealing with larger datasets.
* The test doesn't consider other factors like cache performance, which could impact the results.

**Library Used:**

None. This benchmark is a native JavaScript implementation without any external libraries.

**Special JS Feature/Syntax:**

The spread operator (`...`) is a relatively new feature introduced in ES6. It's a shorthand way to create a new array by spreading an existing array's elements into it. This syntax was adopted later as part of the ECMAScript 2015 standard (ES6).

Other alternatives:

* Other methods for adding elements to an array, like `unshift()` or `splice()`, are not tested in this benchmark.
* If you want to compare the performance of other array manipulation techniques, such as using `forEach()` or `map()`, you can create additional test cases.

I hope this explanation helps you understand what's being tested in this JavaScript microbenchmark!

Related benchmarks:

Array concat vs spread operator vs push for single arg (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: 4 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):