Benchmark: spread vs push set creation

Tests:

spread
const a = [1,2,3]; const b = [4,5,6]; new Set([...a, ...b]);
push
const a = [1,2,3]; const b = [4,5,6]; a.push(b); new Set(a);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
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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**Overview of the Benchmark**

The provided benchmark measures the performance difference between creating a set from two arrays using the spread operator (`...`) versus pushing one array into another and then creating a set from that new array.

**What is being tested?**

The test case uses the `Set` object, which is a collection of unique values. In JavaScript, sets are used to store multiple values without duplicates.

The benchmark compares two approaches:

1. Using the spread operator (`...`) to create a new array with all elements from both arrays, and then creating a set from that new array.
2. Pushing one array into another, modifying the original array, and then creating a set from that modified array.

**Options compared**

The two options being compared are:

* Using the spread operator (`...`) to create a new array with all elements from both arrays.
* Pushing one array into another, modifying the original array, and then creating a set from that modified array.

**Pros and Cons of each approach:**

1. **Using the spread operator (`...`)**:
	* Pros:
		+ Creates a new array with unique values (no duplicates).
		+ Can be more readable and easier to understand.
	* Cons:
		+ May incur additional memory allocation and copying of data, which can impact performance in some cases.
2. **Pushing one array into another**:
	* Pros:
		+ Avoids creating a new array, reducing memory allocation and copying overhead.
	* Cons:
		+ Modifies the original array, which may be undesirable in some scenarios.
		+ May lead to unexpected behavior or performance issues if not handled carefully.

**Library usage**

There is no explicit library usage mentioned in this benchmark. However, it's worth noting that the `Set` object is a built-in JavaScript feature, and its implementation is likely to vary across browsers and environments.

**Special JS features/syntax**

This benchmark does not use any special JavaScript features or syntax beyond what is required for the test cases (e.g., using spread operator, etc.). However, it's worth noting that some browsers may have specific optimizations or quirks when it comes to set creation or array manipulation.

**Other alternatives**

If you wanted to compare this benchmark with other approaches, here are a few options:

* Using `Array.from()` to create a new array from the original arrays.
* Creating an object instead of a set (e.g., using `Object.assign()`) and then using `Set` on that object's values.

These alternatives would require additional test cases and modifications to the benchmark script.

Related benchmarks:

spread vs push set creation (version: 0)

Comparing performance of: spread vs push

Created: 5 years ago by: Guest

Jump to the latest result

spread

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):