Benchmark: Array.from() vs toString()

Script Preparation code:

for (i = 100000; i < 20001; i++) {}

Tests:

Array.from()
Array.from(i)
toString()
i.toString()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from()
toString()

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; rv:109.0) Gecko/20100101 Firefox/119.0

Browser/OS: Firefox 119 on Windows

View result in a separate tab

Test name	Executions per second
Array.from()	14032301.0 Ops/sec
toString()	1042775616.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition**

The test is designed to compare two approaches: using `Array.from()` and `toString()`. The purpose of this comparison is likely to determine which method is more efficient for converting an array-like object (in this case, a simple integer `i`) into an array.

**Options Compared**

There are only two options being compared:

1. **`Array.from(i)`**: This approach uses the `Array.from()` method, which was introduced in ECMAScript 2015 (ES6). It takes an iterable object (in this case, a number) and converts it into an array.
2. **`i.toString()`**: This approach simply converts the integer `i` to a string using the `toString()` method.

**Pros and Cons**

*   **`Array.from(i)`**:
    *   Pros: More modern and efficient way of creating arrays, as it uses a native method that is implemented in the browser's engine.
    *   Cons: May not be supported in older browsers or environments.
*   **`i.toString()`**:
    *   Pros: Wide support across different browsers and environments, including older ones.
    *   Cons: Less efficient than `Array.from(i)`, as it involves additional string conversion steps.

**Library and Special JavaScript Feature**

There is no specific library used in this benchmark. However, the `Array.from()` method is a built-in JavaScript feature introduced in ES6.

**Other Considerations**

*   The test starts by preparing an array-like object with 100,001 integers using the `for` loop (this is done to ensure that the tests are not affected by any optimizations related to integer ranges).
*   There's no user-defined function or custom JavaScript syntax involved in this benchmark.

**Alternatives**

If you were to recreate a similar benchmark, you could use other methods for creating arrays or converting numbers to strings. Some examples include:

*   Using `Array.create()` (an older method that is still supported in some browsers)
*   Utilizing `Uint8Array` and then converting it to an array using the `Array.from()` method
*   Converting integers directly to arrays by pushing them individually into a new array using array literal syntax (`[i, i, ...]`)
*   Using polyfills for older browsers that may not support `Array.from()`

Keep in mind that each alternative will have its own trade-offs and potential limitations.

Related benchmarks:

Array.from() vs toString() (version: 0)

Comparing performance of: Array.from() vs toString()

Created: one year ago by: Guest

Jump to the latest result

Array.from()

toString()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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