Benchmark: Array.prototype.concat vs spread operator js

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 ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

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 dive into explaining the provided benchmark.

**What is being tested?**

The benchmark is comparing two approaches for concatenating arrays in JavaScript:

1. **`Array.prototype.concat()`**: A traditional method of concatenating arrays using the `concat()` method, which creates a new array by copying elements from the original array and adding them to the end.
2. **ES6 spread operator (`...`)**: The new syntax introduced in ECMAScript 2015 for spreading array elements into a new array.

**Options compared**

The benchmark is comparing two options:

* `Array.prototype.concat()`
* ES6 spread operator (`...`)

**Pros and Cons of each approach:**

* **`Array.prototype.concat()`**:
	+ Pros:
		- Widely supported and well-established method.
		- Often considered more explicit and easier to understand for some developers.
	+ Cons:
		- Creates a new array, which can lead to performance issues if the original arrays are large.
		- Can be slower than the spread operator due to the overhead of creating a new array.
* **ES6 spread operator (`...`)**:
	+ Pros:
		- More concise and expressive syntax.
		- Creates a new array without the overhead of `concat()`, making it potentially faster.
	+ Cons:
		- Less widely supported in older browsers and versions (pre ES6).
		- May not be as clear to some developers due to its non-obvious nature.

**Library and special JS feature:**

There are no external libraries used in this benchmark. The test case only uses built-in JavaScript features.

**Test users special JS feature or syntax:**

The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015, so it's likely that the target audience for this benchmark includes developers who are familiar with ES6+ code and its syntax. The use of spread operators suggests that the test cases may be aimed at modern browsers and environments.

**Other alternatives:**

For array concatenation, there is also another option:

* **`Array.prototype.push()`**: Another method to concatenate arrays by pushing elements onto the end of an existing array. This approach is similar to `concat()`, but it modifies the original array instead of creating a new one.
	+ Pros:
		- Modifies the original array, which can be beneficial for performance in some cases.
	+ Cons:
		- Can be less readable and more error-prone due to potential side effects on the original data.

However, this alternative is not explicitly tested in the provided benchmark.

Related benchmarks:

Array.prototype.concat vs spread operator js (version: 0)

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

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

Created: 3 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

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):