Benchmark: indexOf vs search 2

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) + '\n';
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;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared options, pros and cons, library usage, special JS features, and alternatives.

**Benchmark Overview**

The benchmark compares four different string searching methods: `indexOf`, `search`, `exec`, and their Unicode versions (`search` and `exec`) using a predefined string `str`. The goal is to determine which method is the fastest.

**String Preparation Code**

The script preparation code defines two regex patterns:

1. `NEWLINE`: matches newline characters (`\x0d\x0a`) and line breaks (`[\x0a\u2028\u2029]`).
2. `NEWLINE_U`: an Unicode version of `NEWLINE`, using the `u` flag to enable Unicode support.

The script also defines a long string `str` that contains repeated newline characters, which will be used for searching.

**Test Cases**

Each test case is defined by a JSON object with two properties:

1. `Benchmark Definition`: specifies the JavaScript code that performs the search operation.
2. `Test Name`: labels the test case.

The four test cases are:

1. `indexOf`
2. `search` (with the `NEWLINE` regex)
3. `exec` (with the `NEWLINE` regex)
4. `exec (U)` (with the `NEWLINE_U` regex)

**Comparison**

The benchmark compares the execution time of each test case across different browsers and devices.

**Options Compared**

The options being compared are:

1. `indexOf`: uses the `indexOf()` method to search for a substring.
2. `search`: uses the `search()` method to search for a regular expression pattern in a string.
3. `exec`: uses the `exec()` method to execute a regular expression pattern and returns the first match.

**Pros and Cons**

Here's a brief summary of each option:

1. `indexOf`:
	* Pros: simple, widely supported, fast.
	* Cons: only searches for an exact substring match, not a regex pattern.
2. `search`:
	* Pros: can search for a regex pattern, relatively fast.
	* Cons: may be slower than `indexOf` for simple substring searches.
3. `exec`:
	* Pros: can execute a full regex pattern, returns the first match.
	* Cons: generally slower than `indexOf` and `search`.

**Library Usage**

None of the test cases use any external libraries.

**Special JS Features**

The benchmark uses some special JavaScript features:

1. The `u` flag is used to enable Unicode support in the `NEWLINE_U` regex pattern.
2. The `repeat()` method is used to create a long string with repeated newline characters.

These features are widely supported across modern browsers, but may not be present in older or less-capable browsers.

**Alternatives**

Other alternatives for string searching include:

1. `match()` method: can search for a regex pattern and return all matches.
2. `regex.test()` method: can test a regex pattern against a string and return a boolean result.
3. Third-party libraries like jQuery's `regex` or other regex engines.

However, the `indexOf`, `search`, and `exec` methods are generally more efficient and widely supported than these alternatives.

Related benchmarks:

indexOf vs search 2 (version: 0)

String searching

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

Created: 3 years ago by: Guest

Jump to the latest result

indexOf

search

search (u)

exec

exec (U)

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):