Benchmark: Array.from(string) vs string.split("")

Script Preparation code:

myString = "abcdefg".repeat(100);

Tests:

Array.from
const myArray = Array.from(myString);
string.split
const myArray = myString.split("");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
string.split

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents a benchmark test between `Array.from()` and `string.split("")` on a string with a large number of repetitions (100 times). The goal is to determine which method is faster.

**Options Compared:**

Two options are being compared:

1. **Array.from()**: This method creates a new array from an iterable or an array-like object.
2. **string.split("")**: This method splits a string into an array of substrings, using the empty string as the separator.

**Pros and Cons:**

**Array.from():**

Pros:

* More readable and maintainable code, especially when working with iterables or array-like objects.
* Provides more control over the array creation process, such as specifying the type of data to be included.

Cons:

* May have performance overhead due to the need to create a new array object.
* Can be slower for very large datasets.

**string.split(""):**

Pros:

* Often faster and more efficient than `Array.from()`, especially for large datasets.
* Does not require creating a new array object, which can reduce memory usage.

Cons:

* May lead to less readable code, especially when dealing with complex string manipulation.
* Can be less maintainable due to its simplicity.

**Other Considerations:**

* Both methods have their own strengths and weaknesses. `Array.from()` is more flexible but may incur performance overhead, while `string.split("")` is faster but less flexible.
* The choice between the two methods depends on the specific use case, such as whether you need to process a large dataset or prefer a more readable approach.

**Library Usage:**

None of the provided benchmark cases uses any external libraries. Both methods are built-in JavaScript functions.

**Special JS Feature/Syntax:**

The test cases do not mention any special JavaScript features or syntax, so we can focus on the standard functionality of `Array.from()` and `string.split("")`.

**Alternative Approaches:**

Other alternatives to compare could include:

* Using a different string manipulation library (e.g., Unicode Normalization)
* Comparing performance with other array creation methods (e.g., `Array.prototype.map()`, `Array.prototype.filter()`)
* Testing the impact of buffer allocation on performance

By running this benchmark, developers can gain insight into the performance characteristics of these two standard JavaScript functions and make informed decisions about which method to use in their own code.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Browser/OS: Firefox 94 on Ubuntu

View result in a separate tab

Test name	Executions per second
Array.from	28418.7 Ops/sec
string.split	166765.9 Ops/sec

Related benchmarks:

Array.from(string) vs string.split("") (version: 0)

Comparing performance of: Array.from vs string.split

Created: 5 years ago by: Guest

Jump to the latest result

Array.from

string.split

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):