Benchmark: Es Par String o Regrex

Tests:

Buscar con slice
const esPar = (x) => [0,2,4,6,8].includes(`${x}`.slice(-1) * 1); esPar(10);
Buscar con regex
const esPar = (x) => /.*[02468]$/.test(x); esPar(10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Buscar con slice
Buscar con regex

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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I'd be happy to explain the benchmark being measured on MeasureThat.net.

**Overview**

The benchmark measures the performance of two different approaches: using the `slice()` method and regular expressions (`regex`) in JavaScript to extract the last digit from a string.

**Options Compared**

There are two main options compared:

1. **Using `slice()`**: This approach uses the `slice()` method to extract the last character of the input string, multiplies it by 1 (which is equivalent to simply taking the remainder when divided by 10), and then checks if the resulting value is in the array `[0,2,4,6,8]`.
2. **Using Regular Expressions (`regex`)**: This approach uses a regular expression (`/.*[02468]$/.test(x)`) that matches any string that ends with one of the digits 0, 2, 4, 6, or 8.

**Pros and Cons**

**Using `slice()`**:

Pros:

* Simple and straightforward implementation
* No additional dependencies required

Cons:

* `slice()` can be slow for large strings due to its overhead (e.g., creating a new array)
* May not perform as well as regular expressions, which are optimized for performance

**Using Regular Expressions (`regex`)**:

Pros:

* Often faster than `slice()` for large strings
* Can match more complex patterns with a single expression

Cons:

* Additional dependencies required (e.g., support for the regular expression engine in the browser)
* More complex implementation, which can be harder to optimize

**Library Used**

In this benchmark, the regular expressions are used through the `/.*[02468]$/.test(x)` pattern. The library is not explicitly mentioned, but it's likely that the browser's built-in support for regular expressions is being used.

**Special JavaScript Feature or Syntax**

There are no special JavaScript features or syntaxes mentioned in this benchmark.

**Other Considerations**

The performance of these two approaches can vary depending on factors such as:

* String length and complexity
* Browser implementation and optimizations
* Optimizations applied to the `slice()` method (e.g., using a sparse array)

**Alternatives**

If you're looking for alternative approaches, some options could be:

* Using a dedicated library like [regex-try](https://github.com/paul-houdashet/regex-try) or [string-performance-tests](https://github.com/mattias-lindahl/string-performance-tests)
* Implementing a custom string extraction function that avoids the overhead of `slice()` or regular expressions
* Using a different algorithm, such as using the modulo operator (`%`) to extract the last digit

Related benchmarks:

Es Par String o Regrex (version: 0)

Comparing performance of: Buscar con slice vs Buscar con regex

Created: 2 years ago by: Guest

Jump to the latest result

Buscar con slice

Buscar con regex

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):