Benchmark: is_array, is_string

Script Preparation code:

var array = ["H", "E", "L", "L", "O", "."];
var string = "Hello.";


function is_array(array){
  if(array.constructor === Array){
      return true;
  }
  return false;
}

function is_string(string){
  if(typeof string === "string"){
    return true;
  }
  return false;
}

Tests:

is_array
is_array(string);
is_string
is_string(string);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
is_array
is_string

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared, and considered.

**Benchmark Overview**

The benchmark is designed to test two functions: `is_array` and `is_string`. These functions take a variable as input and return a boolean value indicating whether the input is an array or a string, respectively. The benchmark measures how long it takes for each function to execute on different browsers and devices.

**Options Compared**

The two options compared are:

1. **`Array.isArray()`**: This is a built-in JavaScript method that checks if a variable is an array. It's supported in modern browsers and Node.js.
2. **`typeof string === "string"`**: This is a simple type check that uses the `typeof` operator to determine if a variable is a string. However, this approach has limitations, as it doesn't account for Unicode strings.

**Pros and Cons**

1. **`Array.isArray()`**:
	* Pros: Fast and accurate, works with modern browsers and Node.js.
	* Cons: May not work well with older browsers or specific edge cases.
2. **`typeof string === "string"`**:
	* Pros: Easy to implement and understand, works in most situations.
	* Cons: May return false positives for Unicode strings (e.g., emojis) and has limited support in older browsers.

**Other Considerations**

1. **Library Usage**: The `is_array` function uses the `Array.isArray()` method, which is a built-in JavaScript method. No external libraries are used.
2. **Special JS Feature/Syntax**: There's no special JavaScript feature or syntax being tested in this benchmark.

**Alternatives**

If you wanted to modify or extend this benchmark, here are some alternatives:

1. Test other functions that check for different data types (e.g., `is_number`, `is_object`).
2. Introduce variables with specific properties (e.g., NaN, Infinity) to test how these functions handle edge cases.
3. Use different browsers or devices to test the benchmark on various platforms.

By understanding what's being tested in this benchmark, you can apply similar principles when designing your own benchmarks for JavaScript performance testing.

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0

Browser/OS: Firefox 124 on Windows

View result in a separate tab

Test name	Executions per second
is_array	1965609600.0 Ops/sec
is_string	1957260032.0 Ops/sec

Related benchmarks:

is_array, is_string (version: 0)

Comparing performance of: is_array vs is_string

Created: 6 years ago by: Guest

Jump to the latest result

is_array

is_string

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):