Benchmark: Array.prototype.slice vs For i loop

HTML Preparation code:

<script src="lodash.js"></script>

Script Preparation code:

var array = [...Array(10000).keys()];

Tests:

For
for (let i = 0; i < array.size; i++) { array.delete(array.keys().next().value); if (i > 1000 - 1) break; }
Array.prototype.slice
array.slice(-9000)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For
Array.prototype.slice

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):

LLMs can make mistakes. Check important info.

I'll break down the benchmark definition and test cases for you.

**Benchmark Definition:**

The benchmark measures two different approaches to remove elements from an array in JavaScript:

1. **For loop**: This approach uses a traditional `for` loop to iterate over the array, delete each element, and check if it's time to stop after removing 1000 elements.
2. **Array.prototype.slice**: This approach uses the `slice()` method to create a new array with a subset of the original array's elements.

**Options Compared:**

The benchmark compares the performance of these two approaches on an array of 10,000 elements.

**Pros and Cons of Each Approach:**

* **For loop**:
	+ Pros:
		- Easy to understand and implement.
		- Can be optimized for specific use cases (e.g., using `Array.prototype.findIndex()`).
	+ Cons:
		- Can be slow due to the iteration overhead.
		- Requires manual management of indices and bounds checking.
* **Array.prototype.slice**:
	+ Pros:
		- Fast and efficient, as it creates a new array with a subset of elements.
		- Minimizes the number of operations required (only one `slice()` call).
	+ Cons:
		- Can be slower for very large arrays due to the overhead of creating a new array.
		- May not be suitable for use cases requiring random access or modifying the original array.

**Library Used:**

The benchmark uses the popular JavaScript utility library, Lodash. Specifically, it relies on the `Array.prototype.keys()` method and `Array.prototype.next()` method (which is supported in modern browsers).

**Special JS Feature/Syntax:**

The benchmark does not use any special JavaScript features or syntax beyond what's commonly used in web development.

**Other Considerations:**

When creating benchmarks like this, it's essential to consider the following:

* **Warm-up and idle time**: Ensure that the test runs long enough to account for warm-up periods and any inherent idle times in the system.
* **Repeatable results**: Use techniques like randomization or caching to ensure consistent results across multiple runs.
* **System variability**: Consider running benchmarks on different systems, browsers, and hardware configurations to ensure applicability to diverse scenarios.

**Alternatives:**

If you're interested in creating similar benchmarks, consider exploring the following alternatives:

* V8 Benchmark Suite (for Chrome-specific optimizations)
* JavaScript benchmarking frameworks like JSPerf or micro-benchmarking libraries like `micro-bench`

Related benchmarks:

Array.prototype.slice vs For i loop (version: 0)

Comparing performance of: For vs Array.prototype.slice

Created: 2 years ago by: Guest

Jump to the latest result

For

Array.prototype.slice

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):