Benchmark: Array intersection, iteration vs higher order functions

Script Preparation code:

function isIntersectingIter(first, second) {
    for (const item of first) {
        if (second.includes(item)) {
            return true;
        }
    }
};


function isIntersectingHof(first, second) {
    for (const item of first) {
        if (second.includes(item)) {
            return true;
        }
    }
};


var f = ["first", "second", "third"];
var s = ["third", "fourth", "fifth", "sixth"];

Tests:

iteration
isIntersectingIter(f,s); isIntersectingIter(s,f);
HOF
isIntersectingHof(f,s); isIntersectingHof(s,f);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
iteration
HOF

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 measures the performance difference between two approaches to find the intersection of two arrays: iteration vs higher-order functions (HOF). The functions `isIntersectingIter` and `isIntersectingHof` are defined in the script preparation code. Both functions iterate over the first array and check if each item is included in the second array using the `includes()` method.

**Approaches Compared**

1. **Iteration**: This approach uses a simple loop to iterate over the first array, and for each item, it checks if the second array includes that item using the `includes()` method.
2. **Higher-Order Functions (HOF)**: This approach uses the same `includes()` method, but wraps it in an anonymous function (`function () { return second.includes(item); }`) to create a higher-order function.

**Pros and Cons of Each Approach**

1. **Iteration**:
	* Pros: Simple, easy to understand, and often faster due to cache locality.
	* Cons: May be slower for large arrays due to the overhead of the `includes()` method.
2. **Higher-Order Functions (HOF)**:
	* Pros: Often faster for large arrays because the `includes()` method is optimized in V8 (the JavaScript engine used by Chrome).
	* Cons: Can be less intuitive and more verbose, especially for complex use cases.

**Library Used**

None explicit libraries are mentioned in the benchmark definition or test case scripts. However, it's worth noting that the `includes()` method uses a proprietary algorithm implemented by Mozilla, which is now widely adopted by other browsers.

**Special JavaScript Feature/Syntax**

The `includes()` method was introduced in ECMAScript 2019 (ES2020) and is supported by most modern browsers. It's a more concise and efficient way to check if an array includes a specific value compared to traditional methods like `indexOf()` or `some()`.

**Alternative Approaches**

If the benchmark were to compare other approaches, some alternatives could be:

1. **Using `some()`**: Instead of `includes()`, you can use the `some()` method to check if any element in an array satisfies a condition.
2. **Using `every()``: Alternatively, you can use the `every()` method to check if all elements in an array satisfy a condition.
3. **Manual iteration using `indexOf()`**: This approach would involve manually iterating over the second array and checking the index of each item using `indexOf()`.

Related benchmarks:

Array intersection, iteration vs higher order functions (version: 0)

Comparing performance of: iteration vs HOF

Created: 2 years ago by: Guest

Jump to the latest result

iteration

HOF

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):