Benchmark: Array.from vs string split vs spread unicode

Script Preparation code:

var s1 = "foo";
var s2 = "𠮷𠮾".concat("🌈").concat("🐉");

Tests:

Array.from
let n1 = Array.from(s1); let n2 = Array.from(s2);
string split
let n1 = s1.split(''); let n2 = s2.split('');
spread operator
let n1 = [...s1]; let n2 = [...s2];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
string split
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
Array.from	2728308.2 Ops/sec
string split	3105097.5 Ops/sec
spread operator	6116480.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark test on MeasureThat.net, comparing the performance of three approaches to process Unicode strings: `Array.from`, `string.split()`, and the spread operator (`...`).

**Approaches Compared**

1. **Array.from**: This method creates a new Array instance from an iterable or an array-like object.
2. **string.split('')**: This method splits a string into an array of substrings using a regular expression that matches any character (in this case, an empty string).
3. **Spread Operator (`...`)**: This operator is used to create a new array by spreading the elements of an existing array or iterable.

**Pros and Cons of Each Approach**

1. **Array.from**:
	* Pros: Efficient and concise way to create arrays from iterables or arrays-like objects.
	* Cons: May not be optimized for performance, especially when dealing with large datasets.
2. **string.split('')**:
	* Pros: Can be used to process strings in a more functional programming style.
	* Cons: May incur significant overhead due to the regular expression engine, which can lead to slower performance.
3. **Spread Operator (`...`)**:
	* Pros: Concise and expressive way to create arrays from existing iterables or arrays-like objects.
	* Cons: May not be as efficient as `Array.from` for large datasets.

**Library Used (if any)**

None mentioned in the provided JSON, but if you were to use a library like Lodash or Ramda, they might provide alternative implementations of these methods that could impact performance.

**Special JavaScript Features/Syntax**

None explicitly mentioned in the provided JSON. However, it's worth noting that the `string.split('')` method uses a regular expression engine, which is a common source of performance issues when dealing with Unicode strings.

**Other Alternatives**

If you were to consider alternative approaches for processing Unicode strings, some options might include:

* Using a library like ICU (International Components for Unicode) or Unicode.js to handle Unicode normalization and processing.
* Utilizing WebAssembly (WASM) or WebGPU to offload computations to the GPU or CPU, which could provide significant performance improvements.

Keep in mind that these alternatives would likely involve additional dependencies, complexity, and expertise. The `Array.from`, `string.split('')`, and spread operator approaches are relatively simple and widely supported, making them a good starting point for benchmarking and comparison.

Related benchmarks:

Array.from vs string split vs spread unicode (version: 0)

Comparing performance of: Array.from vs string split vs spread operator

Created: 2 years ago by: Guest

Jump to the latest result

Array.from

string split

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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