Benchmark: Extracting part of long URL string via various methods3

Extracting part of long URL string via various methods3 (version: 1)

Comparing performance of: Match RegEx via Lookahead and Capture Group vs Replace Unwanted Parts with Replace RegEx vs String Split and Reference Array Index with length -1 (const intermediate) vs String Split and Reference Array Index with length -1 (var intermediate) vs String Split and Reference Array Index with length -1 (no intermediate var) vs String Split with pop

Created: 5 years ago by: Registered User

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Script Preparation code:

var strUrl = 'https://website.com/?blahRef=766f2afedcc311ea3333a6ba9e46292aae400001&sdtid=14265950&sdop=1&sdpid=139549172&sdfid=9&lno=1&trd=https%20www%20othersite%20com%20p%20germ%20x%20o%20&pv=&au=&sdttt=jjj%7Crecombbb%7C25b08e67-1a86-44e1-aae9-73920b9b44c2&u2=https%3A%2F%2Fwww.website.com%2Fp%2Fgerm-x-original-hand-sanitizer-32-fl-oz%2F-%2FA-797633334642';

Tests:

Match RegEx via Lookahead and Capture Group
strUrl.match(/(?:.+)(?=http)(.+)/)[1];
Replace Unwanted Parts with Replace RegEx
strUrl.replace(/(?:.+)(?=http)/g,'');
String Split and Reference Array Index with length -1 (const intermediate)
var arrStringSplitLen = strUrl.split('http'); 'http'+arrStringSplitLen[arrStringSplitLen.length-1];
String Split and Reference Array Index with length -1 (var intermediate)
'http'+strUrl.split('http').pop();
String Split and Reference Array Index with length -1 (no intermediate var)
strUrl.substr(strUrl.lastIndexOf('http'));
String Split with pop
strUrl.slice(strUrl.lastIndexOf('http'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Match RegEx via Lookahead and Capture Group
Replace Unwanted Parts with Replace RegEx
String Split and Reference Array Index with length -1 (const intermediate)
String Split and Reference Array Index with length -1 (var intermediate)
String Split and Reference Array Index with length -1 (no intermediate var)
String Split with pop

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 break down the provided JSON and explain what is being tested, compared options, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition is a string that represents the code to be executed. In this case, it's a JavaScript expression that extracts part of a long URL string using different methods.

**Options Compared**

There are six different methods compared in the benchmark:

1. `strUrl.match(/(?:.+)(?=http)(.+)/)[1]`: Uses regular expressions to extract the HTTP part of the URL.
2. `strUrl.replace(/(?:.+)(?=http)/g,'')`: Uses the `replace()` method with a regular expression to remove the non-HTTP parts of the URL.
3. `var arrStringSplitLen = strUrl.split('http');\r\n'http'+arrStringSplitLen[arrStringSplitLen.length-1]`: Splits the URL into an array and then uses array indexing to extract the HTTP part.
4. `'http'+strUrl.split('http').pop();`: Similar to option 3, but uses string concatenation instead of array indexing.
5. `strUrl.substr(strUrl.lastIndexOf('http'));`: Uses the `substr()` method to extract the last occurrence of 'http' in the URL.
6. `strUrl.slice(strUrl.lastIndexOf('http'));`: Uses the `slice()` method to extract a subset of characters from the URL starting at the last occurrence of 'http'.

**Pros and Cons**

Each option has its own pros and cons:

* **Regular Expressions (Options 1 and 2)**: Pros - efficient, flexible; Cons - can be slow, complex.
* **Array Indexing (Options 3 and 4)**: Pros - simple, fast; Cons - may not work for all edge cases, requires array creation.
* **Substring Methods (Options 5 and 6)**: Pros - simple, easy to understand; Cons - may not work for all edge cases, can be slow.

**Other Considerations**

* The benchmark uses a large URL string with many characters, which can affect the performance of each option.
* The `match()` method is more efficient than `replace()`, but only when used correctly. In this case, it's using a lookahead and capture group, which may not be optimal.
* The use of array indexing (options 3 and 4) creates an intermediate variable, which can increase memory allocation overhead.

**Libraries**

There are no specific libraries mentioned in the benchmark definition.

**Special JS Features or Syntax**

The benchmark uses special JavaScript features and syntax, including:

* Regular expressions with lookahead and capture groups
* Array indexing with negative indices
* The `split()`, `substr()`, and `slice()` methods

These features and syntax are not explicitly explained in the benchmark result, but they can be found in various online resources or documentation.

**Alternatives**

Other alternatives for extracting part of a URL string include:

* Using a dedicated URL parsing library, such as URL (in modern browsers) or URLSearchParams (in Node.js)
* Using a regex pattern with a more complex structure
* Using a different approach altogether, such as using a hash table to store the URL parts.

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