Benchmark: array filtering with some vs array filtering with includes (1000 elements)

Script Preparation code:

function createObjectsArray(n) {
	let arr = [];
  	const salt=(Math.random() + '').slice(2,3);
  	while(n > 0) {
    	arr.push({
        	id: n+salt,
          name: 'name' + n + salt
        })
      n--;
    }
  return arr;
}
//var listOfObjects_1 = [{id: 1, name: '1'}, {id: 2, name: '2'}, {id: 5, name: '5'}]
var listOfObjects_1 = createObjectsArray(1000)
//var listOfObjects_2 = [{id: 1, name: '1'}, {id: 2, name: '2'}, {id: 5, name: '4'}]
var listOfObjects_2 = createObjectsArray(1000)

Tests:

array filtering with some
listOfObjects_1.filter(selectedItem => listOfObjects_2.some(item => item.id === selectedItem.id) )
array filtering with includes
var ids_1 = listOfObjects_1.map(o => o.id) listOfObjects_2.filter(o => ids_1.includes(o.id))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array filtering with some
array filtering with includes

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark tests two different approaches for filtering an array of objects based on matching IDs.

**Test Case 1:  `array filtering with some`**

* **Benchmark Definition:** `listOfObjects_1.filter(selectedItem => listOfObjects_2.some(item => item.id === selectedItem.id))`
* **Explanation:** This approach iterates through each object in `listOfObjects_1`. For every object, it checks if an object with the same ID exists in `listOfObjects_2` using the `.some()` method. If a match is found, the current object from `listOfObjects_1` is included in the filtered result.

* **Pros:**
    * Potentially efficient for smaller arrays because `.some()` stops searching once it finds a match.
* **Cons:**
    * Can be less efficient than `.includes()` if many objects in `listOfObjects_1` don't have matching IDs in `listOfObjects_2`.

**Test Case 2: `array filtering with includes`**

* **Benchmark Definition:**  `var ids_1 = listOfObjects_1.map(o => o.id)\r\nlistOfObjects_2.filter(o => ids_1.includes(o.id))`
* **Explanation:** This approach first extracts all the IDs from `listOfObjects_1` and stores them in a new array (`ids_1`). Then, it filters `listOfObjects_2`, keeping only objects whose IDs exist in the `ids_1` array using the `.includes()` method.

* **Pros:**
    * Can be more efficient than `.some()` for larger arrays because `includes()` has optimized lookup times for known values within an array.

* **Cons:**
    * Requires an extra step to create the `ids_1` array, potentially adding a slight overhead.

**Other Considerations**

* **Array Size:** For very large arrays, the efficiency difference between these approaches might become more noticeable.

* **Distribution of IDs:** If the IDs in `listOfObjects_1` and `listOfObjects_2` are not evenly distributed, one approach might be more efficient than the other depending on the data patterns.

Let me know if you have any further questions!

Related benchmarks:

array filtering with some vs array filtering with includes (1000 elements) (version: 0)

Return only objects with same id

Comparing performance of: array filtering with some vs array filtering with includes

Created: 5 years ago by: Guest

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array filtering with some

array filtering with includes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):