Benchmark: concat, spread, push

Tests:

concat
let pep = ['test', 1, true]; let pop = [0,1,2,3].concat(pep);
spread
let pep = ['test', 1, true]; let pop = [0,1,2,3,...pep];
push
let pep = ['test', 1, true]; let pop = [0,1,2,3]; pop.push(...pep);
concat2
let pep = ['test', 1, true]; let pop = [0,1,2,3]; let count = 0; while (count <= 100) { pep = pep.concat(pop); count++; }
spread2
let pep = ['test', 1, true]; let pop = [0,1,2,3]; let count = 0; while (count <= 100) { pep = [pep, ...pop]; count++; }
push2
let pep = ['test', 1, true]; let pop = [0,1,2,3]; let count = 0; while (count <= 100) { pep.push(...pop); count++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread
push
concat2
spread2
push2

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 break down the benchmark and its test cases.

**What is tested:**
The benchmark tests three ways to concatenate or spread arrays in JavaScript:

1. **Concatenation using `push`**: Using the `push()` method to add elements to an array.
2. **Spread syntax (`...`)**: Using the spread operator (`...`) to expand an array into multiple arguments.
3. **Concise concatenation**: A shorthand way of concatenating two arrays using a single expression.

**Options compared:**
The benchmark compares the performance of these three approaches:

* `concat` (using the `concat()` method)
* `spread` (using the spread operator (`...`))
* `push` (using the `push()` method)

**Pros and Cons:**

1. **Concatenation using `push`:**
	* Pros:
		+ Can be used in a loop, as shown in test case "concat2".
		+ Allows for easy addition of multiple elements to an array.
	* Cons:
		+ Can be slower than other methods, especially for large arrays.
		+ May cause performance issues due to repeated function calls.
2. **Spread syntax (`...`):**
	* Pros:
		+ Fast and efficient, as it only requires a single operation.
		+ Convenient for expanding an array into multiple arguments.
	* Cons:
		+ Requires modern JavaScript features (ES6+).
		+ May not work as expected in older browsers or environments.
3. **Concise concatenation:**
	* Pros:
		+ Concise and readable syntax.
	* Cons:
		+ Not widely supported by older browsers or environments.

**Library usage:**
None of the test cases use a specific JavaScript library, but it's worth noting that the benchmark is designed to run on modern JavaScript engines, which may include libraries like jQuery.

**Special JS feature or syntax:**
The spread operator (`...`) is used in two test cases ("spread" and "spread2"), which are part of the ES6+ syntax. This means that only browsers supporting ES6+ (like Firefox 84) will be able to run these tests efficiently.

**Other alternatives:**
There are other ways to concatenate or spread arrays in JavaScript, such as using `Array.prototype.push.apply()` or `Array.prototype.concat.call()`. However, the benchmark focuses on three commonly used approaches:

* **Using `push()`**: As shown in test case "concat2".
* **Using an array method**: Such as `concat()` (test case "concat") or `join()` (not explicitly mentioned but implied).
* **Using a spread operator (`...`)**: As shown in test cases "spread" and "spread2".

Keep in mind that there may be other, less common approaches to concatenating or spreading arrays in JavaScript.

Related benchmarks:

concat, spread, push (version: 0)

trying to figure out which performs better

Comparing performance of: concat vs spread vs push vs concat2 vs spread2 vs push2

Created: 5 years ago by: Guest

Jump to the latest result

concat

spread

push

concat2

spread2

push2

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):