Benchmark: array from string and slice or substring and array from shorter string

Script Preparation code:

var example = '4444444444'

Tests:

slice
var result = Array.from(example.substring(0, 5));
substr
var result = Array.from(example).slice(0,5);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down what's being tested in the provided JSON benchmark.

**Benchmark Definition:**
The benchmark compares three different approaches to convert a string into an array and then slice or extract a subset from it:

1. `Array.from()` with `substring()`
2. `Array.from()` with slicing (`slice()`)
3. `Array.from()` with substring extraction (`substr`)

In essence, the benchmark is testing which approach is faster when only considering the start index of the slice or substr operation.

**Options Compared:**

* **Approach 1:** `Array.from()` followed by `substring(0, 5)`. This method creates a new array from the original string and then extracts a subset of 5 characters using `substring()`.
* **Approach 2:** `Array.from()` followed by `.slice(0, 5)`. This method also creates a new array from the original string but uses the `.slice()` method to extract a subset of 5 characters.
* **Approach 3:** `Array.from()` followed by `substr(0, 5)`. This method extracts a substring of 5 characters using `substr()` before creating the array.

**Pros and Cons:**

* **Approach 1 (Array.from() + substring())**: Pros:
	+ Easy to read and understand.
	+ No additional processing required after extracting the substring.
*   Cons:
	+ Can be slower due to the overhead of creating a new array from the original string.
*   Approach 2 (.slice() method): Pros: 
    *   Fast and efficient, as it uses a built-in method for slicing arrays.
    *   Does not create an additional array from the original string.
    Cons:
    *   May require additional processing steps after slicing to extract the desired substring.
*   Approach 3 (substr method): Pros:
	+ Can be faster than using .slice() due to the optimized nature of substr() for substring extraction.
    However, it may require additional processing steps before extracting the desired substring.

**Library and Special JS Features:**

* No external libraries are used in this benchmark.
* The `Array.from()` method is a built-in JavaScript function that creates a new array from an iterable or array-like object. It's a relatively modern feature introduced in ECMAScript 2015 (ES6).

**Other Considerations:**

* The benchmark only considers the start index of the slice or substr operation, ignoring any differences in performance for other indices.
* The use of `example` as a string variable suggests that this benchmark may be relevant for scenarios where strings need to be processed and sliced.

**Alternatives:**
Some alternative approaches could include:

* Using a dedicated library like Lodash to perform the slicing operations.
* Implementing custom slicing functions using regular expressions or other methods.
* Comparing the performance of different string manipulation techniques, such as concatenation vs. array slicing.

Keep in mind that this benchmark is likely intended to compare the performance of `Array.from()` with `substring()` and `.slice()`, but further modifications or additions could provide more comprehensive insights into JavaScript performance optimization strategies.

Related benchmarks:

array from string and slice or substring and array from shorter string (version: 0)

Compares slice, substr and substring to each other when there is only a start index

Comparing performance of: slice vs substr

Created: 4 years ago by: Guest

Jump to the latest result

slice

substr

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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