Benchmark: Performance formatted phone number. Regex replace vs slice. Ver. 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 compile
strOut = value.replace(regex, mask);
Replace inline
strOut = value.replace(/(\d{1})(\d{3})(\d{3})(\d{2})(\d{2})/, mask);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Slice
Replace compile
Replace inline

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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**Benchmark Overview**

The provided benchmark, "Performance formatted phone number. Regex replace vs slice. Ver. 2", tests the performance of two approaches to format a phone number: using regular expressions (Regex) and using the `slice()` method.

**Approaches Compared**

1. **Slice**: This approach uses the `slice()` method to extract parts of the phone number string and then concatenates them to form the formatted phone number.
2. **Replace compile**: This approach uses a compiled regular expression to replace the original phone number string with the formatted one.
3. **Replace inline**: This approach uses an inline regular expression (within the `replace()` method) to replace the original phone number string with the formatted one.

**Pros and Cons of Each Approach**

1. **Slice**:
	* Pros: Simple, easy to understand, and widely supported by most browsers.
	* Cons: May be slower than regular expressions due to the overhead of slicing a large string.
2. **Replace compile**:
	* Pros: Can be faster than `slice()` since it compiles the regular expression once and reuses it for each execution.
	* Cons: Requires compiling the regular expression, which may add some overhead.
3. **Replace inline**:
	* Pros: Combines the benefits of both approaches (compiled regular expressions and inline usage).
	* Cons: Still requires compiling the regular expression, but does so only once.

**Library Used**

None are explicitly mentioned in the benchmark definition or test cases.

**Special JS Features/Syntax**

No special JavaScript features or syntax are used beyond what is standard for browser JavaScript execution.

**Benchmark Preparation Code Explanation**

The preparation code for this benchmark consists of:
```javascript
var value = '78005553535'; // Phone number to be formatted

var regex = /(\\d{1})(\\d{3})(\\d{3})(\\d{2})(\\d{2})/; // Compiled regular expression
var mask = '+$1 ($2) $3-$4-$5'; // Replacement string
```

The `slice()` method is used to extract the individual parts of the phone number:
```javascript
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);
```

The formatted phone number is then constructed using the `slice()` method:
```javascript
strOut = `+${countryCode} (${regionCode}) ${partOne}-${partTwo}-${partThree}`;
```

**Alternative Approaches**

Other approaches that could be used to format a phone number include:

1. **Using template literals**: This approach would allow for a more concise and readable way of formatting the phone number.
```javascript
const strOut = `+${value.slice(0, 1)} (${value.slice(1, 4)}) ${value.slice(4, 7)}-${value.slice(7, 9)}-${value.slice(9, 11)}`;
```
2. **Using a library function**: Some libraries, like Moment.js, provide functions for formatting phone numbers.
```javascript
const moment = require('moment');
const formattedPhoneNumber = moment(value).format('+ (XXX) XXX-XX-XX');
```
3. **Using a regex with capture groups**: This approach would allow for more flexibility in the formatting process.
```javascript
const strOut = value.replace(/^(\d{1})(\d{3})(\d{3})(\d{2})(\d{2})$/, '+$1 ($2) $3-$4-$5');
```
Note that these alternative approaches may have different performance characteristics and requirements than the original approach used in the benchmark.

Related benchmarks:

Performance formatted phone number. Regex replace vs slice. Ver. 2 (version: 0)

Comparing performance of: Slice vs Replace compile vs Replace inline

Created: 4 years ago by: Guest

Jump to the latest result

Slice

Replace compile

Replace inline

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):