Benchmark: Remove array object, findIndex and splice vs filter

Tests:

Splice (first item)
const a = [{id: "a"}, {id: "b"}, {id: "c"}, {id: "d"}, {id: "e"}, {id: "f"},{id: "g"},{id: "h"},{id: "i"},{id: "j"},{id: "k"},{id: "l"}]; const indexToRemove = a.findIndex(i => i === "a"); const b = a.splice(indexToRemove, 1);
Splice (last item)
const a = [{id: "a"}, {id: "b"}, {id: "c"}, {id: "d"}, {id: "e"}, {id: "f"},{id: "g"},{id: "h"},{id: "i"},{id: "j"},{id: "k"},{id: "l"}]; const indexToRemove = a.findIndex(i => i === "l"); const b = a.splice(indexToRemove, 1);
Filter (first item)
const a = [{id: "a"}, {id: "b"}, {id: "c"}, {id: "d"}, {id: "e"}, {id: "f"},{id: "g"},{id: "h"},{id: "i"},{id: "j"},{id: "k"},{id: "l"}]; const b = a.filter(item => item.id !== "a")
Filter (last item)
const a = [{id: "a"}, {id: "b"}, {id: "c"}, {id: "d"}, {id: "e"}, {id: "f"},{id: "g"},{id: "h"},{id: "i"},{id: "j"},{id: "k"},{id: "l"}]; const b = a.filter(item => item.id !== "l")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Splice (first item)
Splice (last item)
Filter (first item)
Filter (last item)

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/119.0

Browser/OS: Firefox 119 on Windows

View result in a separate tab

Test name	Executions per second
Splice (first item)	16141789.0 Ops/sec
Splice (last item)	10887840.0 Ops/sec
Filter (first item)	15421973.0 Ops/sec
Filter (last item)	10961924.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark is defined as "Remove array object, findIndex and splice vs filter". This indicates that the benchmark is testing two different approaches:

1. **Removing an item from an array using `splice`**: Specifically, finding the index of the item to be removed using `findIndex` and then removing it from the array.
2. **Filtering out items from an array using `filter`**: Removing items from the array without specifying their indices.

**Test Cases**

There are four test cases:

1. **Splice (first item)**: This test case removes the first item from the array using `splice`.
2. **Splice (last item)**: This test case removes the last item from the array using `splice`.
3. **Filter (first item)**: This test case removes all items except the first one using `filter`.
4. **Filter (last item)**: This test case removes all items except the last one using `filter`.

**Options Compared**

The options being compared are:

* Using `splice` to remove an item from an array
* Using `findIndex` before `splice`
* Using `filter` to remove items from an array

**Pros and Cons of Each Approach**

1. **Splice**: This approach is straightforward and efficient for removing a single item from the beginning or end of the array. However, it modifies the original array and can be slower if the array is large.
2. **FindIndex + Splice**: This approach finds the index of the item to be removed using `findIndex` and then uses `splice` to remove it. This method avoids modifying the original array but requires an additional lookup operation.
3. **Filter**: This approach creates a new array with only the desired items, which can be more efficient for large arrays since it avoids modifying the original array.

**Pros of Filter:**

* Efficient for large arrays
* Does not modify the original array

**Cons of Filter:**

* Creates a new array, which can be memory-intensive
* Can be slower if the filter condition is complex

**Pros of Splice and FindIndex + Splice:**

* Modify the original array in place
* Avoids creating a new array, which can reduce memory usage

**Cons of Splice and FindIndex + Splice:**

* Modify the original array, which can be undesirable for some use cases
* Requires an additional lookup operation using `findIndex`

**Other Considerations**

* Performance impact of modifying the original array vs. creating a new one
* Impact of array size on performance (e.g., large arrays may benefit from `filter`)

**Library Usage**

None of the test cases explicitly use any external libraries, but it's worth noting that some JavaScript engines may optimize certain functions or methods for specific libraries.

**Special JS Features or Syntax**

None of the test cases rely on special JavaScript features or syntax. They only use standard JavaScript operators and data structures.

**Alternatives**

Other alternatives to these approaches include:

* Using `slice()` or other array slicing methods instead of `splice`
* Using `map()` and `reduce()` in combination with `filter()` for more complex filtering scenarios
* Using libraries like Lodash or Ramda, which provide optimized versions of common operations

Related benchmarks:

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

Comparing performance of: Splice (first item) vs Splice (last item) vs Filter (first item) vs Filter (last item)

Created: 3 years ago by: Guest

Jump to the latest result

Splice (first item)

Splice (last item)

Filter (first item)

Filter (last item)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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