Benchmark: Performance formatted phone number. Regex replace vs slice

Script Preparation code:

var value = '78005553535';
var regex = /(\d{1})(\d{3})(\d{3})(\d{2})(\d{2})/;
var mask = '+$1 ($2) $3-$4-$5';

Tests:

Slice
const countryCode = value.slice(0, 1); const regionCode = value.slice(1, 4); const partOne = value.slice(4, 7); const partTwo = value.slice(7, 9); const partThree = value.slice(9, 11); strOut = `+${countryCode} (${regionCode}) ${partOne}-${partTwo}-${partThree}`;
Replace
strOut = value.replace(this.regex, this.mask);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Slice
Replace

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 dive into the benchmark and explore what's being tested.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark that compares two approaches to format a phone number: using regular expressions (regex) with `replace()` method versus using array slicing (`slice()`). The benchmark aims to measure which approach is more efficient.

**Options Compared**

Two options are compared:

1. **Regex Replace**: This approach uses the `replace()` method with a regex pattern to extract and replace the phone number format.
2. **Slice**: This approach uses array slicing to extract individual parts of the phone number and then concatenates them using template literals.

**Pros and Cons of Each Approach**

**Regex Replace**

Pros:

* Easier to read and maintain, as it's a more declarative syntax
* Less prone to errors, as the regex pattern is self-documenting

Cons:

* Can be slower due to the overhead of regular expressions (regex engines need to parse and execute the pattern)
* May not perform well on older browsers or systems with limited regex support

**Slice**

Pros:

* Generally faster, as it avoids the overhead of regex engines
* More control over the formatting process, as each part is extracted separately

Cons:

* More verbose and error-prone, as it requires manual management of array indices
* May be less readable for complex formats

**Library Used (Regex)**

The `replace()` method uses a built-in JavaScript function to execute the regex pattern. The regex engine is responsible for parsing and executing the pattern, which can introduce overhead.

**Special JS Feature/Syntax**

This benchmark does not use any special JavaScript features or syntax beyond what's available in the standard library.

**Other Alternatives**

If the goal was to format a phone number, other alternatives might include:

* Using a dedicated library like `PhoneNumberJS` or `country-code`
* Utilizing a formatting function from a utility library like `lodash`
* Implementing a custom formatting function using arithmetic operations and string concatenation

In this specific benchmark, both approaches are comparing the performance of regular expressions versus array slicing for formatting a phone number. The choice between these two approaches depends on the trade-offs between readability, maintainability, and performance.

Related benchmarks:

Performance formatted phone number. Regex replace vs slice (version: 0)

Comparing performance of: Slice vs Replace

Created: 4 years ago by: Guest

Jump to the latest result

Slice

Replace

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):