Benchmark: MySliceTest - MeasureThat.net

Script Preparation code:

var list = [];
for (var i = 0; i < 1000 * 1000; i++) {
  list.push(i);
}

Tests:

slice
list.push('slice'); list = list.slice(50);
splice
list.push('splice'); list.splice(0, 50);
shift
list.push('splice'); for (let i = 0; i<50; i++) { list.shift(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
splice
shift

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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 JSON represents a benchmark that tests three different methods for modifying an array:

1. `slice`: creates a new array containing a subset of elements from the original array using the `Array.prototype.slice()` method.
2. `splice`: modifies the original array by removing or replacing elements at specific indices using the `Array.prototype.splice()` method.
3. `shift`: removes elements from the beginning of the array using the `Array.prototype.shift()` method.

These tests are designed to measure the performance differences between these three methods for various sizes of arrays.

**Options compared**

The benchmark compares the execution time of each method:

* `slice`: creates a new array and copies a subset of elements from the original array.
* `splice`: modifies the original array in place, which can be faster but also more memory-intensive.
* `shift`: removes elements from the beginning of the array without creating a new array.

**Pros and cons**

Here's a brief summary of the pros and cons of each method:

1. **slice**:
	* Pros: creates a new array, preserves the original array, can be more predictable.
	* Cons: requires additional memory allocation, may incur higher overhead due to function call.
2. **splice**:
	* Pros: modifies the original array in place, can be faster for large arrays.
	* Cons: modifies the original array, can be less predictable, may cause issues with array indices.
3. **shift**:
	* Pros: removes elements from the beginning of the array without creating a new array, efficient memory usage.
	* Cons: only works on non-empty arrays, can cause index issues if not used carefully.

**Library and syntax considerations**

In this benchmark, there are no libraries or external dependencies required. The tests are self-contained JavaScript code that runs directly in the browser.

However, it's worth noting that the `slice()` method was introduced in ECMAScript 5 (ES5), which is supported by most modern browsers. The `splice()` and `shift()` methods have been part of the language since its inception.

**Other alternatives**

For larger array sizes or more complex data structures, other methods might be more suitable:

* For large arrays, using `Array.prototype.subarray()` or `Array.prototype.copyWithin()` instead of `slice()` could provide better performance.
* For inserting or deleting multiple elements at once, `splice()` is often a good choice. However, if the number of operations is high, using an array-based data structure like a linked list might be more efficient.

In summary, this benchmark provides a straightforward comparison between three common array modification methods in JavaScript: `slice`, `splice`, and `shift`. The results can help developers understand the trade-offs involved in choosing these methods for their specific use cases.

Related benchmarks:

MySliceTest (version: 0)

MySliceTest

Comparing performance of: slice vs splice vs shift

Created: 5 years ago by: Guest

Jump to the latest result

slice

splice

shift

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):