Benchmark: pad zero - MeasureThat.net

Tests:

slice
('0' + 1).slice(-2)
String.constructor.padStart
String(1).padStart(2, '0')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
String.constructor.padStart

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/116.0.0.0 Safari/537.36

Browser/OS: Chrome 116 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
slice	914241856.0 Ops/sec
String.constructor.padStart	12076833.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark JSON and explain what's being tested, compared, and some of the pros and cons associated with each approach.

**Benchmark Definition**
The benchmark definition is null, which means that the script preparation code and HTML preparation code are also null. This suggests that the benchmark is designed to test a specific JavaScript operation or function without any external dependencies or setup requirements.

**Individual Test Cases**

There are two test cases:

1. `slice`: This test case uses the `slice()` method on a string literal `'0' + 1`. The `slice()` method extracts a section of a string and returns it as a new string object.
2. `String.constructor.padStart`: This test case uses the `padStart()` method on a string created using the `String` constructor with the argument `'1'`.

**Libraries**

There is no explicit library mentioned in the benchmark JSON. However, the `String` constructor and the `slice()` and `padStart()` methods are part of the JavaScript Standard Library.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Options Compared**

The options being compared are:

* Using `slice()`: This method extracts a section of a string and returns it as a new string object.
* Using `padStart()` with the `String` constructor: This method pads a string with a specified character (in this case, `'0'`) to a minimum length.

**Pros and Cons**

Using `slice()`:

Pros:

* Efficient for extracting a specific section of a string
* Portable across different browsers and environments

Cons:

* Can be slower than using `padStart()`, especially for large strings
* May not be as intuitive or straightforward to use, especially for developers without prior experience with string manipulation

Using `padStart()` with the `String` constructor:

Pros:

* More modern and expressive syntax compared to `slice()`
* Can be more efficient for padding a string to a minimum length

Cons:

* Requires a specific version of JavaScript (ECMAScript 2017+) that supports the `String` constructor
* May not work in older browsers or environments that don't support this feature

**Other Alternatives**

Other alternatives to test the same functionality could include using other methods for string manipulation, such as:

* Using template literals (`${}`) with concatenation operators (`+`)
* Using regular expressions (regex) to match and extract a specific section of a string
* Using array methods like `slice()` on an array of characters or strings

However, these alternatives may not be as straightforward or efficient as using the built-in `slice()` and `padStart()` methods.

**Benchmark Preparation Code**

The benchmark preparation code is null, which means that no custom setup or initialization code is required to run the benchmark. This makes it easier for users to run the benchmark without worrying about external dependencies or setup requirements.

**Latest Benchmark Result**

The latest benchmark result shows two tests:

* `slice`: The test case using `slice()` returns an average of 914,241,856 executions per second.
* `String.constructor.padStart`: The test case using `padStart()` with the `String` constructor returns an average of 12,076,833 executions per second.

These results suggest that `padStart()` with the `String` constructor is faster than using `slice()`, especially for longer strings. However, this may not be surprising given the modern syntax and optimization techniques used in recent versions of JavaScript.

Related benchmarks:

pad zero (version: 0)

Comparing performance of: slice vs String.constructor.padStart

Created: one year ago by: Guest

Jump to the latest result

slice

String.constructor.padStart

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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