Benchmark: whitespace detection 2

Script Preparation code:

function isWhitespace(s, index) {
  const ch = s[index];
  return ch === " " || ch === "\n" || ch === "\r" || ch === "\t";
}

function isWhitespaceString(s) {
  for (let i = 0, ii = s.length; i < ii; i++) {
    if (!isWhitespace(s, i)) {
      return false;
    }
  }
  return true;
}

function isWhitespaceString1(s) {
	return /\s+/.test(s);
}

var s1 = "       \t              \n\n\r\t       \n"
var s2 = "  klfdgjlfsdjgjk";

Tests:

loop
var n1 = isWhitespaceString(s1);
regex
var n2 = isWhitespaceString1(s1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
loop
regex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The provided JSON represents two JavaScript microbenchmarks: `whitespace detection 2`. The benchmark tests the performance of three different approaches to detect whitespace characters in a string.

**Approach 1: Manual Looping**

The first approach, `isWhitespaceString(s)`, uses a manual loop to iterate through each character in the string. It checks if each character is a whitespace character (space, newline, carriage return, or tab). If any non-whitespace character is found, the function returns `false`. If all characters are whitespace, it returns `true`.

**Pros:**

* Easy to understand and implement
* No external dependencies required

**Cons:**

* Can be slow for large strings due to the explicit loop
* May not be optimized for performance

**Approach 2: Regular Expression**

The second approach, `isWhitespaceString1(s)`, uses a regular expression (`/\\s+/`) to match any whitespace character in the string. The `\s` character class matches any whitespace character, and the `+` quantifier matches one or more of these characters.

**Pros:**

* Fast and efficient for matching multiple whitespace characters
* Can be optimized using JavaScript's built-in regular expression engine

**Cons:**

* May not match all types of whitespace characters (e.g., Unicode whitespace)
* Requires understanding of regular expressions

**Approach 3: Built-in Functionality**

The third approach, likely used by modern browsers and JavaScript engines, uses the `test()` method on a regular expression object. This is similar to Approach 2 but is optimized for performance.

**Pros:**

* Fast and efficient for matching multiple whitespace characters
* Automatic Unicode support

**Cons:**

* Requires understanding of regular expressions and built-in function calls

**Library and Special JS Features**

The benchmark uses the `test()` method, which is a part of JavaScript's built-in functionality. This suggests that the benchmark is optimized for modern browsers and JavaScript engines.

There are no special JavaScript features or syntax used in this benchmark.

**Alternative Approaches**

Other approaches to detect whitespace characters could include:

* Using a library like `lodash` or `underscore`, which provide utility functions for string manipulation.
* Using a native language feature, such as the `isWhitespace()` function on some platforms (e.g., Windows).
* Implementing a more advanced algorithm, such as a Boyer-Moore algorithm, to detect whitespace characters.

**Benchmark Preparation Code**

The provided JavaScript code defines three functions:

1. `isWhitespace(s, index)`: checks if a single character at the given index is a whitespace character.
2. `isWhitespaceString(s)`: checks if all characters in the string are whitespace characters using the manual loop approach.
3. `isWhitespaceString1(s)`: checks if any character in the string is a whitespace character using regular expressions.

The code also defines two test strings, `s1` and `s2`, which contain different types of whitespace characters.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. `loop`: tests the manual loop approach.
2. `regex`: tests the regular expression approach.

Each test case runs a single line of JavaScript code that calls one of the whitespace detection functions and assigns the result to a variable named `n`.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36

Browser/OS: Chrome 87 on Linux

View result in a separate tab

Test name	Executions per second
loop	360744.2 Ops/sec
regex	4827495.0 Ops/sec

Related benchmarks:

whitespace detection 2 (version: 0)

Comparing performance of: loop vs regex

Created: 3 years ago by: Guest

Jump to the latest result

loop

regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):