Benchmark: test set please ignore

Script Preparation code:

var set = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9]);
var array = [3, 4, 5];

Tests:

set add
array.forEach(item => set.add(item));
es6
set = new Set([...set, ...array]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
set add
es6

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The provided JSON defines a JavaScript microbenchmark called "test set please ignore." It consists of two test cases: "set add" and "es6." These tests measure the performance of adding elements to a Set data structure in JavaScript.

**Set Data Structure**

A `Set` is a built-in JavaScript data structure that stores unique values, known as "elements," in a specific order. The main operations on Sets are:

1.  `add(element)`: Adds an element to the set.
2.  `has(element)`: Returns true if the element exists in the set; false otherwise.

In the benchmark, we're testing these two methods: `array.forEach(item => set.add(item))` and `set = new Set([...set, ...array])`.

**Options Compared**

There are two approaches to add elements to a Set:

1.  **Traditional Method:** `array.forEach(item => set.add(item))`

*   This method iterates over each element in the array using `forEach`, adds it to the Set using the `add` method, and repeats this process for each element.
    *   The main advantage of this approach is that it allows us to add elements from any iterable (like arrays or strings).
    *   However, since we're adding individual elements one by one, the overhead of function calls and variable assignments might be higher compared to other methods.
2.  **ES6 Spread Syntax Method:** `set = new Set([...set, ...array])`

*   This method uses the spread operator (`...`) to create a new array with all elements from both the original set (`set`) and the input array (`array`).
    *   It then creates a new Set from this combined array.
    *   The main advantage of this approach is that it's more concise and can be faster since it avoids function calls and variable assignments.

**Pros and Cons**

*   **Traditional Method:**
    *   Pros:
        *   Allows adding elements from any iterable.
        *   Can be useful for certain use cases where the spread syntax isn't applicable.
    *   Cons:
        *   More overhead due to individual element additions.
        *   Might be slower compared to the ES6 method.
*   **ES6 Spread Syntax Method:**
    *   Pros:
        *   Concise and expressive code.
        *   Can be faster since it avoids function calls and variable assignments.
    *   Cons:
        *   Only applicable when adding elements from arrays or other iterables.

**Library Used**

None of the provided benchmark cases use a library. The `Set` data structure is a built-in JavaScript feature.

**Special JS Feature/Syntax**

The ES6 spread syntax (`...`) used in the second test case is a new feature introduced in ECMAScript 2015 (ES6). It allows creating arrays or objects from iterable sources, such as other arrays, strings, or objects. This syntax is not specific to browsers and can be used in Node.js environments as well.

**Other Alternatives**

If you need to add elements to a Set from non-array sources, you might consider using:

*   `JSON.stringify()`: Converts an object into a string, which can then be iterated over.
*   `String.prototype.split()`: Splits a string into an array of substrings.

However, these alternatives may not provide the same level of performance or conciseness as the ES6 spread syntax method.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser/OS: Chrome 105 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
set add	3845066.5 Ops/sec
es6	821357.4 Ops/sec

Related benchmarks:

test set please ignore (version: 3)

Comparing performance of: set add vs es6

Created: 2 years ago by: Registered User

Jump to the latest result

set add

es6

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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