Benchmark: Search string engine benchmark

Script Preparation code:

/**
 * Boyer Moor Horspool
 */
function boyerMooreHorspool(haystack, needle) {
    var badMatchTable = {};
    var maxOffset = haystack.length - needle.length;
    var offset = 0;
    var last = needle.length - 1;
    var scan;

    if (last < 0) return 0;

    for (var i = 0; i < needle.length - 1; i++) {
      badMatchTable[needle[i]] = last - i;
    }

    while (offset <= maxOffset) {
      for (scan=last; needle[scan] === haystack[scan+offset]; scan--) {
        if (scan === 0) {
          return offset;
        }
      }

      offset += badMatchTable[haystack[offset + last]] || last || 1;
    }
    return -1;
}

function randomString() {
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for (var i = 0; i < 5; i++)
      text += possible.charAt(Math.floor(Math.random() * possible.length));

    return text;
}
 
var str = randomString();
var findme = "a";
var findmeRegex = new RegExp(find);

Tests:

search
var result = str.search(findme);
indexOf
var result = str.indexOf(findme) > -1;
includes
var result = str.includes(findme);
test
var result = findmeRegex.test(str);
match
var result = str.match(findmeRegex);
boyerMooreHorspool
var result = boyerMooreHorspool(str, findmeRegex);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
search
indexOf
includes
test
match
boyerMooreHorspool

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 world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition: Boyer-Moore Horspool Search String Engine**

The benchmark tests various string searching algorithms in JavaScript, which is essential for many applications, including text processing, data retrieval, and more. The Boyer-Moore Horspool algorithm is a popular optimization of the classic linear search algorithm, known for its high performance.

**Options Compared:**

1. **`str.includes(findme)`**: Uses the `includes()` method to check if a substring (`findme`) exists in the string (`str`). This method returns a boolean value indicating whether the substring is found.
2. **`findmeRegex.test(str)`**: Uses a regular expression (regex) to test if the string (`str`) matches the pattern defined by `findmeRegex`. The `test()` method returns a boolean value indicating whether the string matches the regex pattern.
3. **`str.match(findmeRegex)`**: Returns an array of matches for the regex pattern in the string (`str`). This method can return an empty array if no match is found.
4. **`str.search(findme)`**: Searches for the first occurrence of `findme` in the string (`str`) and returns its index (or -1 if not found).
5. **`boyerMooreHorspool(str, findmeRegex)`**: Implements the Boyer-Moore Horspool algorithm to search for `findme` in the string (`str`). The algorithm returns the starting index of the match or -1 if no match is found.

**Pros and Cons:**

* **`includes()`**: Simple and easy to understand, but may have performance issues with large strings.
* **`test()` and `match()`**: Use regex patterns, which can be powerful but also complex to maintain. Performance may vary depending on the complexity of the pattern.
* **`search()`**: Fast and efficient, but requires the string's length to be known in advance.
* **`boyerMooreHorspool()`**: Optimized for performance, but more complex to understand and implement.

**Other Considerations:**

* The benchmark tests a short random string (`str`) generated by `randomString()`, which may not accurately represent real-world use cases.
* The Boyer-Moore Horspool algorithm is an optimization of linear search, making it suitable for large strings. However, its performance may degrade if the input string has many repeated characters or patterns.

**Library and Special JS Features:**

The benchmark uses no external libraries besides the built-in `RegExp` class for regex testing. There are no special JS features mentioned in this benchmark.

**Alternatives:**

For similar benchmarks, consider using:

* Micro-benchmarking frameworks like Jest or Mocha.
* Online platforms like Google's Benchmarks or Apple's Performance Comparison Tool.
* Real-world use cases and profiling tools to analyze performance differences between algorithms.

Related benchmarks:

Search string engine benchmark (version: 0)

Comparing performance of: search vs indexOf vs includes vs test vs match vs boyerMooreHorspool

Created: 7 years ago by: Guest

Jump to the latest result

search

indexOf

includes

test

match

boyerMooreHorspool

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):