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: 4 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';

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

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:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser/OS: Chrome 84 on Windows

View result in a separate tab

Test name	Executions per second
Match RegEx via Lookahead and Capture Group	1620662.8 Ops/sec
Replace Unwanted Parts with Replace RegEx	103375.3 Ops/sec
String Split and Reference Array Index with length -1 (const intermediate)	3298802.0 Ops/sec
String Split and Reference Array Index with length -1 (var intermediate)	3140513.5 Ops/sec
String Split and Reference Array Index with length -1 (no intermediate var)	3305088.2 Ops/sec
String Split with pop	3310777.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

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:

strUrl.match(/(?:.+)(?=http)(.+)/)[1]: Uses regular expressions to extract the HTTP part of the URL.
strUrl.replace(/(?:.+)(?=http)/g,''): Uses the replace() method with a regular expression to remove the non-HTTP parts of the URL.
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.
'http'+strUrl.split('http').pop();: Similar to option 3, but uses string concatenation instead of array indexing.
strUrl.substr(strUrl.lastIndexOf('http'));: Uses the substr() method to extract the last occurrence of 'http' in the URL.
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.

LLMs can make mistakes. Check important info.

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.

Related benchmarks: