Benchmark: str split vs spread long string

Script Preparation code:

var str = "Donec accumsan dolor eu est congue porta. Nam dignissim lectus id nibh aliquam, molestie interdum libero sagittis. Nullam ac mattis ex. Nam massa lorem, pulvinar sed fringilla sed, iaculis vel ante. Pellentesque finibus nibh enim, ut finibus leo fermentum ut. Aenean vel turpis a turpis luctus ultrices. Integer feugiat, sapien vel accumsan consequat, urna augue iaculis augue, vel tempus mauris arcu sed enim. Morbi pulvinar nec ipsum sit amet vehicula. Curabitur in erat magna.";

Tests:

split
var other = str.split('');
spread
var other = [...str];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
spread

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 12; 22101316G) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 103 on Android

View result in a separate tab

Test name	Executions per second
split	615776.6 Ops/sec
spread	204532.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON benchmark.

**Benchmark Definition**

The test compares two approaches to split a long string:

1. **`str.split('')`**: This method uses the `split()` function with an empty string (`''`) as the separator. The purpose of using an empty string is likely to test how the engine handles splitting on no delimiter.
2. **`[...str]`**: This syntax is called "spread operator" or "distributive array" ( introduced in ECMAScript 2015). It creates a new array by distributing the elements of the string into separate array elements.

**Options Compared**

The test compares these two approaches to see which one is faster, i.e., how many executions per second they can perform on the same input.

**Pros and Cons of Each Approach**

1. **`str.split('')`**:
	* Pros: This approach is simple and efficient for most use cases.
	* Cons: It may not be as effective when dealing with very large strings or complex edge cases, as it relies on a simple string split algorithm.
2. **`[...str]`**:
	* Pros: This approach can handle larger inputs more efficiently and is often faster due to its lazy evaluation nature.
	* Cons: It requires modern JavaScript engines that support the spread operator, which might not be supported in older browsers or environments.

**Library**

There isn't a specific library being used here. The `str` variable is just a regular string, and the `split()` function and spread operator are built-in JavaScript features.

**Special JS Feature/Syntax**

The test uses the spread operator (`[...str]`) which is a relatively new feature introduced in ECMAScript 2015 (ES6). It's not supported in older browsers or environments that don't have modern JavaScript implementations.

**Other Alternatives**

For comparing string splitting approaches, other alternatives might include:

* Using regular expressions with the `RegExp.prototype.split()` method
* Implementing a custom splitting function using loops or iteration

However, these approaches would likely be less efficient and more complex than the two methods being compared in this benchmark.

Related benchmarks:

str split vs spread long string (version: 0)

Comparing performance of: split vs spread

Created: 3 years ago by: Guest

Jump to the latest result

split

spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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