Benchmark: Array.prototype.concat vs spread operator123123123

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 ]

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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 the explanation.

**What is being tested?**

MeasureThat.net is comparing two approaches for creating arrays in JavaScript: `Array.prototype.concat` and the new ES6 spread operator (`...`). The benchmark aims to measure which approach is faster, more efficient, or both.

**Options compared:**

* **Array.prototype.concat**: A traditional method for concatenating arrays by creating a new array with the elements from both input arrays.
* **Spread operator (`...`)**: A new syntax introduced in ES6 that allows spreading an array's elements into another array.

**Pros and Cons of each approach:**

* **Array.prototype.concat**:
	+ Pros:
		- Well-established, widely supported method.
		- Easy to understand for beginners.
	+ Cons:
		- Creates a new array every time it's called, which can lead to performance issues with large datasets.
		- Can be slower than the spread operator due to the overhead of creating a new array.
* **Spread operator (`...`)**:
	+ Pros:
		- More efficient than `concat()` because it only creates a shallow copy of the original array, avoiding the creation of a new array altogether.
		- Allows for more concise code.
	+ Cons:
		- Less well-established and widely supported than `concat()`, which might lead to compatibility issues in older browsers or environments.
		- Requires understanding of the spread operator syntax.

**Library used:**

None explicitly mentioned. However, it's likely that MeasureThat.net uses a JavaScript engine like V8 (used by Chrome) or SpiderMonkey (used by Firefox) under the hood, which might provide optimizations for array operations.

**Special JS feature or syntax:**

* **Spread operator (`...`)**: This is a new syntax introduced in ES6. It allows you to spread an array's elements into another array. The `...` symbol before an array creates a copy of its elements without modifying the original array.
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2, ...params ]; // Spread operator in action!
```
**Other alternatives:**

* **Array.prototype.push()**: While not as efficient as the spread operator, `push()` can also be used to concatenate arrays.
```javascript
var params = [ "hello", true, 7 ];
var other = [];
other.push(1, 2); // push() example
```
Keep in mind that `push()` is more verbose than the spread operator and might not be as efficient for large datasets.

By running this benchmark, MeasureThat.net provides a fair comparison of these two approaches, helping developers understand the performance implications of choosing between them.

Related benchmarks:

Array.prototype.concat vs spread operator123123123 (version: 0)

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

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

Created: 5 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):