Benchmark: Spread + Splice vs Filter

Script Preparation code:

var users = [
  { 'user': 'joey', 'age': 32 },
  { 'user': 'ross', 'age': 41 },
  { 'user': 'chandler', 'age': 39 }
]

Tests:

Filter
const result = users.filter((item, index) => index !== 3);
Spread + Splice
const result = [...users] result.splice(3, 1)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Filter
Spread + Splice

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is being tested?**

The provided benchmark measures the performance difference between three approaches to remove an item from an array in JavaScript:

1. **Filter**: Using the `filter()` method, which creates a new array with all elements that pass the test implemented by the provided function.
2. **Spread + Splice**: Using the spread operator (`...`) to create a copy of the original array and then removing an element using `splice()`.
3. **No Library/ Special JS feature (built-in)**: This approach is likely not being tested, as it would require no additional libraries or special JavaScript features.

**Options compared**

The benchmark compares two approaches:

1. **Filter**: Using the built-in `filter()` method.
2. **Spread + Splice**: Using the spread operator (`...`) to create a copy of the original array and then removing an element using `splice()`.

**Pros and Cons of each approach:**

* **Filter**:
	+ Pros: Simple, efficient, and widely supported.
	+ Cons: Creates a new array, which can be memory-intensive for large datasets.
* **Spread + Splice**:
	+ Pros: No extra memory allocation, as it modifies the original array.
	+ Cons: Less straightforward to implement, requires understanding of spread operators.

In general, `filter()` is a good choice when you need to remove elements from an array without modifying the original array. However, if memory efficiency is crucial, `spread + splice` might be a better option.

**Library usage**

The benchmark uses the built-in JavaScript function `filter()`. This library is part of the standard JavaScript API and does not require any external dependencies.

**Special JS feature/Syntax**

There are no special JavaScript features or syntaxes being used in this benchmark. The code only employs built-in functions and syntax.

**Other alternatives**

If you're interested in exploring alternative approaches, here are a few options:

1. **Array.prototype.map() + Array.prototype.slice()**: Similar to `spread + splice`, but uses `map()` to create a new array with the desired elements.
2. **Array.prototype.indexOf() + Array.prototype.splice()**: Uses `indexOf()` to find the index of the element to remove and then uses `splice()` to delete it from the original array.
3. **Using a for loop**: You can use a traditional for loop to iterate over the array and manually remove elements.

Keep in mind that these alternatives may have different performance characteristics, so you should test them separately if you're concerned about optimization.

Related benchmarks:

Spread + Splice vs Filter (version: 0)

Comparing performance of: Filter vs Spread + Splice

Created: 5 years ago by: Guest

Jump to the latest result

Filter

Spread + Splice

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):