Benchmark: indexOf vs search 3

Script Preparation code:

var NEWLINE = /\x0d\x0a|[\x0a\x0d\u2028\u2029]/;
var NEWLINE_U = /\x0d\x0a|[\x0a\x0d\u2028\u2029]/u;
var str = 'foobarbaz!'.repeat(1000);
window.result = 0;

Tests:

indexOf
result += str.indexOf('\n');
search
result += str.search(NEWLINE);
search (u)
result += str.search(NEWLINE_U);
exec
const match = NEWLINE.exec(str); if (match) result += match.index;
exec (U)
const match = NEWLINE_U.exec(str); if (match) result += match.index;
indexOf all
let index = str.indexOf('\n'); if (index === -1) index = str.indexOf('\r'); if (index === -1) index = str.indexOf('\u2028'); if (index === -1) index = str.indexOf('\u2029'); result += index;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
search
search (u)
exec
exec (U)
indexOf all

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**What is being tested?**

The benchmark is testing different approaches to search for a specific substring (`\n`, `\r`, and `\u2028` or `\u2029`) within a large string `str` that contains these characters repeated multiple times. The goal is to measure which approach is faster.

**Options compared:**

1. **indexOf()**: This method searches for the specified value in the array element from left to right, stopping as soon as it finds a match.
2. **search()**: Similar to indexOf(), but it also performs a case-insensitive search and returns -1 if not found.
3. **exec()**: This method executes a regular expression against a string, searching for a match anywhere in the string.
4. **indexOf all**: A custom implementation that attempts to find one of the substrings first, and if not found, moves on to the next one.

**Pros and Cons:**

* **indexOf()**:
	+ Pros: Simple, efficient, and widely supported.
	+ Cons: Not case-insensitive, may perform poorly with large strings or multiple searches.
* **search()**:
	+ Pros: Case-insensitive, can be more efficient than indexOf() for certain use cases.
	+ Cons: May have performance issues with very large strings or multiple searches.
* **exec()**:
	+ Pros: Can handle complex regular expressions and case sensitivity.
	+ Cons: May be slower due to the overhead of executing a regex.
* **indexOf all**:
	+ Pros: More flexible, can find one of multiple substrings before moving on.
	+ Cons: Custom implementation may introduce extra overhead or complexity.

**Library usage:**

The `NEWLINE` and `NEWLINE_U` variables represent regular expressions used to match the newline characters. These are not libraries in themselves but rather a way to define a pattern for matching.

**Special JS features:**

There is no special JavaScript feature or syntax being tested here, as it's all about comparing different string search methods.

**Other alternatives:**

If you were to implement a custom implementation like `indexOf all`, you could consider using other approaches such as:

* Using `String.prototype.indexOf()` multiple times with different substrings.
* Implementing a binary search-like algorithm for finding the substring in the large string.
* Using a more efficient data structure, such as a Trie or a suffix tree, to store and search the substring.

Keep in mind that each approach has its trade-offs, and the best solution will depend on your specific use case and requirements.

Related benchmarks:

indexOf vs search 3 (version: 0)

String searching

Comparing performance of: indexOf vs search vs search (u) vs exec vs exec (U) vs indexOf all

Created: 3 years ago by: Guest

Jump to the latest result

indexOf

search

search (u)

exec

exec (U)

indexOf all

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):