Benchmark: Single item array to string

Script Preparation code:

var itemArr = ['Item']

Tests:

toString
itemArr.toString()
by index
itemArr[0]
at
itemArr.at(0)
join
itemArr.join('')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toString
by index
at
join

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
toString	19960548.0 Ops/sec
by index	139421568.0 Ops/sec
at	148591680.0 Ops/sec
join	38569664.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and test cases.

**Benchmark Definition:**
The provided JSON represents a JavaScript microbenchmark that tests different approaches to convert an array with a single item to a string. The script preparation code is `var itemArr = ['Item']`, which creates an array with a single element, `'Item'`. There is no HTML preparation code specified, indicating that the benchmark only focuses on JavaScript execution.

**Options Compared:**
The four test cases compare different methods to convert the `itemArr` to a string:

1. `toString()`: Calls the built-in `toString()` method on the array.
2. By Index (`itemArr[0]`): Accesses the first element of the array using square brackets and returns its value as a string.
3. At (`itemArr.at(0)`): Uses the `at()` method (introduced in JavaScript 2021) to access the first element of the array, returning its value as a string.
4. Join (`join('')`): Calls the `join()` method on the array with an empty separator, effectively concatenating all elements into a single string.

**Pros and Cons of Different Approaches:**

* `toString()`: This approach is likely to be the fastest since it leverages built-in JavaScript optimizations.
* By Index (`itemArr[0]`): This method is straightforward but might incur additional overhead due to array indexing. It's still a viable option, but performance may vary depending on the specific implementation and browser.
* At (`itemArr.at(0)`): The `at()` method is relatively new and may not be supported by older browsers or versions of JavaScript. Its performance could be comparable to `toString()`, but this depends on the engine's implementation.
* Join (`join('')`): This approach might perform well if the array contains multiple elements, as it would concatenate all elements into a single string. However, for an array with only one element, it may incur additional overhead due to the unnecessary concatenation.

**Library and Purpose:**
In this benchmark, there is no explicit library mentioned in the JSON definition. The `at()` method, however, uses the ECMAScript Standard Library (ES) implementation of arrays. If a specific library or polyfill were used to support older browsers or versions of JavaScript, it would be indicated in the code.

**Special JS Features or Syntax:**
The benchmark makes use of the `at()` method, which was introduced in JavaScript 2021. This feature allows for safe and efficient array indexing using optional chaining (`?.`) or the `at()` method itself.

In summary, this benchmark compares different approaches to convert a single-element array to a string, showcasing various optimizations and performance characteristics of each method. Understanding these differences can help developers make informed decisions about how to optimize their own code for performance-critical scenarios.

**Other Alternatives:**
Some alternative methods to achieve the same result could be:

* Using `Array.prototype.map()` with an arrow function or a regular function that returns a string.
* Leveraging template literals (`${itemArr[0]}`) if supported by the target browsers and JavaScript version.
* Employing a custom loop to iterate through the array elements and concatenate them into a single string.

Keep in mind that these alternatives might have varying performance characteristics, depending on the specific implementation and browser.

Related benchmarks:

Single item array to string (version: 0)

What is the fastest way to convert an array with a single item to a string

Comparing performance of: toString vs by index vs at vs join

Created: 2 years ago by: Registered User

Jump to the latest result

toString

by index

at

join

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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