Benchmark: Performance formatted phone number. Regex replace vs slice 2

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(regex, 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

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

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Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark measures the performance of two approaches to format a phone number:

1. **Slice**: This approach uses the `slice()` method to extract specific parts of the phone number string (`countryCode`, `regionCode`, `partOne`, `partTwo`, and `partThree`) and then concatenates them with a mask to form the final formatted string.
2. **Replace**: This approach uses a regular expression (`regex`) to replace the entire original phone number string with a new formatted string using a mask.

**Options Compared**

The two options being compared are:

* Slice: Using `slice()` method to extract parts of the string and concatenating them with a mask.
* Replace: Using a regular expression to replace the original string with a new formatted string.

**Pros and Cons**

* **Slice**:
	+ Pros: Simple, easy to understand, and doesn't require any additional libraries or syntax.
	+ Cons: May be slower due to the overhead of creating multiple slice objects.
* **Replace**:
	+ Pros: Can be faster since it's a single operation that replaces the entire string with a new one.
	+ Cons: Requires knowledge of regular expressions, which can be complex and difficult to read.

**Library and Purpose**

In the `Script Preparation Code`, there is a line `var regex = /(\\d{1})(\\d{3})(\\d{3})(\\d{2})(\\d{2})/;`. This defines a regular expression (`regex`) that matches the format of a phone number in the United States. The purpose of this library is to parse and format the phone number string according to a specific pattern.

**Special JS Feature or Syntax**

There isn't any special JavaScript feature or syntax being used in this benchmark, apart from using `slice()` which is a built-in method in JavaScript.

**Other Alternatives**

If you were to implement this benchmark yourself, here are some alternative approaches:

* Using template literals (e.g., `strOut = `${countryCode} (${regionCode}) ${partOne}-${partTwo}-${partThree}`;`) instead of concatenating strings with the `+` operator.
* Using a library like Moment.js or Intl.NumberFormat to format the phone number string in a more standardized way.

Keep in mind that these alternatives may have different performance characteristics and trade-offs, so it's essential to benchmark and test them thoroughly.

Related benchmarks:

Performance formatted phone number. Regex replace vs slice 2 (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):