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:

No previous run results

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

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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: 5 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>

Fastest: N/A

Slowest: N/A

No previous run results

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