Benchmark: Remove array element, findIndex and splice vs filter

Tests:

Splice
const a = ["a", "b", "c", "d", "e"]; const indexToRemove = a.findIndex(i => i === "d"); const b = a.splice(indexToRemove, 1);
Filter
const a = ["a", "b", "c", "d", "e"]; const b = a.filter(item => item !== "d")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice
Filter

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:6.8) Goanna/20260301 PaleMoon/34.1.0

Browser/OS: Pale Moon (Firefox Variant) 34 on Windows

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Test name	Executions per second
Splice	1521356.1 Ops/sec
Filter	26139738.0 Ops/sec

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

LLMs can make mistakes. Check important info.

The provided JSON represents a JavaScript microbenchmark on the MeasureThat.net website. The benchmark compares two approaches to remove an element from an array: using `splice` and using `filter`.

**Approach 1: Using `splice`**

This approach uses the `splice` method to remove the specified index in the array. The syntax is as follows:
```
const a = [\"a\", \"b\", \"c\", \"d\", \"e\"];\r\nconst indexToRemove = a.findIndex(i => i === \"d\");\r\nconst b = a.splice(indexToRemove, 1);
```
This approach has the following pros and cons:

Pros:

* `splice` is an array method that modifies the original array.
* It can be more efficient than other approaches for large arrays.

Cons:

* It modifies the original array, which might not be desirable if the original array needs to be preserved.
* It requires finding the index of the element to remove using `findIndex`, which can be slow for large arrays.

**Approach 2: Using `filter`**

This approach uses the `filter` method to create a new array with the elements that do not match the specified condition. The syntax is as follows:
```
const a = [\"a\", \"b\", \"c\", \"d\", \"e\"];\r\nconst b = a.filter(item => item !== \"d\");
```
This approach has the following pros and cons:

Pros:

* It does not modify the original array, which can be useful if the original array needs to be preserved.
* It is generally faster than using `splice` for large arrays.

Cons:

* It creates a new array with the filtered elements, which can use more memory.
* It returns an empty array if no elements match the condition.

**Other considerations**

When choosing between these two approaches, consider the following factors:

* Memory usage: If memory is a concern, using `filter` might be a better choice since it does not modify the original array and uses less memory.
* Performance: For large arrays, `filter` is generally faster than `splice`.
* Modifying the original array: If you need to preserve the original array, using `filter` is a safer choice.

**Library used**

In this benchmark, the `findIndex` method from the Array prototype object is used. The `findIndex` method returns the index of the first element that satisfies the provided testing function.

**Special JS feature or syntax**

The provided benchmark uses the following JavaScript features:

* Arrow functions (`i => i === \"d\"`)
* Template literals (`const a = [\"a\", ...]`)
* String interpolation (`"item !== \"d\""`)

These features are widely supported in modern JavaScript environments and do not require any special configurations or polyfills.

Related benchmarks:

Remove array element, findIndex and splice vs filter (version: 0)

Comparing performance of: Splice vs Filter

Created: 5 years ago by: Guest

Jump to the latest result

Splice

Filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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