Benchmark: set.has vs. array.includes large 2

Script Preparation code:

var a = [];
for(let i = 0; i < 1000; i++){
  a.push(i);
}
var b = new Set(a)

Tests:

includes
return a.includes(500)
lookup
return b.has(500)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
includes
lookup

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 provided benchmark and its test cases.

**Benchmark Description**

The benchmark compares two approaches: `set.has` (also known as "lookup" in the benchmark) and `array.includes`. These two methods are used to check if an element exists within a set or an array, respectively.

**What is tested?**

In this specific benchmark:

*   A large array (`a`) of 1000 elements is created using a loop.
*   A new Set object (`b`) is created from the array `a`.
*   Two test cases are executed:
    *   One checks if an element (500) exists in the set (`set.has(500)`).
    *   The other checks if an element (500) exists in the array (`array.includes(500)`).

**Comparison of Options**

The benchmark compares two options:

*   **`set.has`** (also known as "lookup"): This method is used to check if a value exists within a Set object. In JavaScript, a Set is an unordered collection of unique values.
    *   Pros:
        *   Efficient lookup: Sets provide fast lookups, with an average time complexity of O(1) for membership testing.
        *   Unique values: Sets ensure that each element is unique, which can be beneficial when working with datasets that contain duplicates or need to eliminate redundant data.
    *   Cons:
        *   Limited use cases: Sets are suitable only for unique values and are not as flexible as arrays for certain operations (e.g., sorting, indexing).
*   **`array.includes`**: This method is used to check if a value exists within an array. In JavaScript, arrays are ordered collections of elements that can have duplicate values.
    *   Pros:
        *   Wide applicability: Arrays can be used for various operations like sorting, indexing, and manipulating data in a sequence-based manner.
        *   Flexibility: Arrays support various methods like `indexOf()`, `filter()`, `map()`, etc., making them more versatile than sets for specific use cases.
    *   Cons:
        *   Inefficient lookup: Arrays provide slower lookups compared to sets, with an average time complexity of O(n) in JavaScript.

**Library/Functionality Used**

The benchmark uses two built-in JavaScript libraries:

*   **Set**: The Set object is used to create a unique collection of elements. This library provides fast membership testing and ensures that each element is unique.
*   **Array**: The Array prototype methods like `includes()` are utilized for checking if an element exists within the array.

**Special JS Features/Syntax**

There are no specific JavaScript features or syntax used in this benchmark, other than built-in libraries and functions like Set and Array.

Related benchmarks:

set.has vs. array.includes large 2 (version: 0)

Comparing performance of: includes vs lookup

Created: 5 years ago by: Guest

Jump to the latest result

includes

lookup

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):