Benchmark: splice vs push - MeasureThat.net

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
splice
push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Windows

View result in a separate tab

Test name	Executions per second
splice	18.1 Ops/sec
push	48.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is an essential task for developers, and MeasureThat.net provides a great platform to compare different approaches.

**Benchmark Definition**

The provided JSON represents a benchmark definition with two test cases:

1. `splice`: This test case uses the `splice()` method to add elements to an array.
2. `push`: This test case uses the `push()` method to add elements to an array.

**Options Compared**

In this benchmark, the only option being compared is between `splice` and `push`. These two methods are used to add elements to an array in JavaScript.

**Pros and Cons of Different Approaches**

Here's a brief analysis of both approaches:

1. **Splice()**
	* Pros:
		+ More flexible, as it allows for modifying the existing array.
		+ Can be used to replace or remove elements from the array.
	* Cons:
		+ Less efficient than `push()` because it involves shifting all elements after the insertion point.
		+ May have performance implications if the array is large and frequently modified.
2. **Push()**
	* Pros:
		+ More efficient, as it only adds a new element to the end of the array without modifying existing ones.
		+ Less likely to cause performance issues when working with large arrays.
	* Cons:
		+ Less flexible than `splice()`, as it doesn't allow for modifying existing elements.

**Library and Purpose**

There are no libraries mentioned in this benchmark definition. The test cases rely solely on built-in JavaScript features.

**Special JS Feature or Syntax**

The only special syntax used in these test cases is the `var` keyword, which declares a variable that has function scope. This is an older syntax, introduced in ECMAScript 1 (1997), and is still supported for compatibility reasons.

**Other Alternatives**

If you were to replace `splice()` or `push()` with alternative methods, here are some options:

* Instead of `splice()`, you could use `unshift()` to add elements to the beginning of an array.
* Instead of `push()`, you could use `concat()` to concatenate two arrays.

However, it's essential to note that these alternatives may have different performance implications and might not be suitable for all use cases.

**Benchmark Preparation Code**

The script preparation code is empty in this benchmark definition. This means that the test cases start with an empty array (`var list = []`) and then execute the provided benchmark definition using `splice()` or `push()`.

Related benchmarks:

splice vs push (version: 0)

Comparing performance of: splice vs push

Created: 5 years ago by: Guest

Jump to the latest result

splice

push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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