Benchmark: List splice multiple

Script Preparation code:

l = 123;

Tests:

append
a = Array(0); a.push(4); a.push(3);
splice
a = Array(0); a.splice(0,0,4,3);
Splice single
a = Array(0); a.splice(0,0,4); a.splice(0,0,3);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
append
splice
Splice single

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 120 on Android

View result in a separate tab

Test name	Executions per second
append	183731.0 Ops/sec
splice	212602.7 Ops/sec
Splice single	162936.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and some of the considerations.

**Benchmark Overview**

The benchmark tests the performance of three different approaches for appending or removing elements from an array in JavaScript: `append`, `splice` (multiple), and `splice` (single). The test cases are designed to isolate the impact of each approach on execution speed.

**Test Cases**

1. **Append**: Creates an array with one element, pushes another two elements onto it (`l = 123;`). The goal is to measure how fast the browser can execute a simple push operation.
2. **Splice (Multiple)**: Creates an array with one element, removes and replaces one position with multiple new elements (`a.splice(0,0,4,3);`). This test case evaluates the performance of the `splice` method when used to replace multiple elements at once.
3. **Splice (Single)**: Similar to Splice (Multiple), but only uses two elements (`a.splice(0,0,4);\r\na.splice(0,0,3);`). This test case assesses the performance of the `splice` method when used to replace a single element.

**Library and Features**

The benchmark does not use any external libraries. However, it relies on built-in JavaScript features like arrays and the `push` and `splice` methods.

There are no specific special JavaScript features or syntax used in this benchmark that would require additional explanation.

**Options Compared**

Three different approaches for array manipulation are compared:

1. **Push**: The simplest way to append elements to an array, using the `push` method.
2. **Splice (Multiple)**: Using `splice` with multiple arguments to replace multiple elements at once.
3. **Splice (Single)**: Using `splice` with a single argument to replace a single element.

**Pros and Cons of Each Approach**

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

1. **Push**: Pros:
	* Simple and efficient.
	* Most browsers will use an optimized version of this operation.
Cons:
	* Can be slower than using `splice` (especially for large arrays).
2. **Splice (Multiple)**: Pros:
	* Faster than pushing multiple elements individually.
	* More efficient when replacing multiple elements at once.
Cons:
	* Requires more arguments, which can lead to function calls overhead.
3. **Splice (Single)**: This approach is essentially the same as Splice (Multiple) but with fewer arguments.

**Considerations**

When choosing an array manipulation method, consider factors like:

* Performance: If speed is critical, using `splice` (multiple) or `push` might be better than using `splice` (single).
* Code readability and maintainability: Using `push` for simple appending can make code easier to understand.
* Browser support: While this benchmark focuses on modern browsers, older versions of Chrome and other browsers may have different performance characteristics.

**Alternatives**

Other alternatives for array manipulation could include:

* Using `unshift` instead of `push` for prepending elements
* Using `concat` or spread operators (`...`) to create new arrays instead of modifying existing ones
* Using libraries like Lodash or Ramda, which provide optimized and tested functions for common array operations

Note that the choice of alternative will depend on the specific use case and requirements.

Related benchmarks:

List splice multiple (version: 0)

Comparing performance of: append vs splice vs Splice single

Created: 2 years ago by: Guest

Jump to the latest result

append

splice

Splice single

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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