Benchmark: split vs slice when getting the last element of an array

Tests:

split case
const text = 'input_11_1000'; const arr = text.split('_'); const last = arr[arr.length - 1];
split + slice case
const text = 'input_11_1000'; const arr = text.split('_'); const lastElement = arr.slice(-1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split case
split + slice case

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
split case	44567644.0 Ops/sec
split + slice case	28970976.0 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 and explain what's being tested.

**Benchmark Definition**

The benchmark is testing two approaches for getting the last element of an array: `split` vs `slice`. The `split` method is used to split a string into an array, while the `slice` method is used to extract a subset of elements from an array.

**Options Compared**

There are two options being compared:

1. `split`: This option uses the `split()` method on a string, which splits the string at a specified delimiter and returns an array.
2. `split + slice`: This option uses both `split` and `slice` methods to achieve the same result.

**Pros and Cons of Each Approach**

**Split:**

Pros:

* Simple and straightforward
* Does not require extra memory allocation

Cons:

* Performance may be slower compared to other approaches due to string splitting
* May have issues with handling non-standard delimiters or edge cases

**Split + Slice:**

Pros:

* More efficient than using `split` alone, especially for large arrays
* Allows for more control over the extraction process

Cons:

* Requires extra memory allocation and processing power
* Adds complexity to the code

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* Performance: If speed is critical, `slice` might be a better choice.
* Code readability: If simplicity and clarity are more important, `split` might be a better fit.
* Edge cases: Be prepared to handle non-standard delimiters or edge cases when using `split`.

**Test Case Libraries**

There is no explicit library mentioned in the benchmark definition. However, it's likely that both `split` and `slice` methods use internal JavaScript libraries.

**Special JS Feature or Syntax**

The test case does not explicitly mention any special JavaScript features or syntax, but it uses some common JavaScript idioms:

* Destructuring assignment (e.g., `const last = arr[arr.length - 1];`)
* Array indexing and slicing (e.g., `arr.slice(-1)`)
* String splitting (e.g., `text.split('_')`)

**Alternatives**

Other alternatives for getting the last element of an array include:

* Using `Math.max()` with a callback function
* Using a reducer function with `Array.prototype.reduce()`
* Using `Array.prototype.at()` (if supported by the browser)

However, these approaches may have different performance characteristics and trade-offs compared to the `split` and `slice` methods.

Related benchmarks:

split vs slice when getting the last element of an array (version: 0)

split vs slice when getting the last element of an array

Comparing performance of: split case vs split + slice case

Created: 2 years ago by: Guest

Jump to the latest result

split case

split + slice case

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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