Benchmark: seperate getcookie vs all cookies (with decode)

Script Preparation code:

function getCookies(str) {
  str = str || document.cookie;
  var reKey = /(?:^|; )([^=]+?)(?:=([^;]*))?(?:;|$)/g;
  var cookies = {};
  var match;
  var cnt = 0;
  while ((match = reKey.exec(str))) {
    cnt += 1;
    reKey.lastIndex = match.index + match.length - 1;
    var k = match[1];
    var v = decodeURIComponent(match[2]);
    if (!!cookies[k]) {
      if (typeof cookies[k] == "string") {
        cookies[k] = [cookies[k]];
      }
      cookies[k].push(v);
    } else {
      cookies[k] = v;
    }
  }
  !!!cnt && (cookies = undefined);
  return cookies;
}
// make the multiple values of the cookie into a comma delimitted string
function all(str) {
  str || document.cookie;
  let cookies = getCookies(str);
  if (!!cookies) {
    if (!!cookies["BGC_AUT_LVL"]) {
      if (typeof cookies["BGC_AUT_LVL"] !== "string") {
        cookies["BGC_AUT_LVL"] = cookies["BGC_AUT_LVL"].join(",");
      }
    }
  } else {
    cookies = {};
  }
  return cookies;
}

function getCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(";");
  for (var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == " ") c = c.substring(1, c.length);
    if (c.indexOf(nameEQ) == 0) {
      var d = c.substring(nameEQ.length, c.length);
      d = decodeRFC(d);
      return d;
    }
  }
  return undefined;
}

function decodeRFC(s) {
  s = s + "";
  return s.replace(/\*/gm, "##").replace(/##/gm, ",").replace(/!/gm, " ");
}

document.cookie = "foo=bar+"+performance.now();
document.cookie = "hello=bar+"+performance.now();
document.cookie = "world=bar+"+performance.now();
document.cookie = "foo=bar2+"+performance.now();

Tests:

gc
var cookie1 = getCookie('foo'); var cookie1 = getCookie('hello'); var cookie1 = getCookie('world'); var cookie1 = getCookie('foo');
all
var cookies = all(); var cookie1= cookies['foo']; var cookie2= cookies['hello']; var cookie3= cookies['world']; var cookie4= cookies['foo'];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
gc
all

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 29 days ago):

LLMs can make mistakes. Check important info.

The provided benchmark evaluates two different approaches for accessing cookies in JavaScript. The focus is on how efficiently cookies can be retrieved from the `document.cookie` string, which is crucial for performance-sensitive applications, especially those that rely heavily on user session management or personalization.

### Comparison of Approaches

1. **Getting Individual Cookies (`getCookie`) - Test Name: `gc`**
   - **Definition:** In this approach, individual cookies are accessed one by one through the `getCookie` function. This function takes a cookie name as an argument, constructs the necessary key, and loops through the string representation of cookies to find the desired value.
   - **Example Code:**
     ```javascript
     var cookie1 = getCookie('foo');
     var cookie1 = getCookie('hello');
     var cookie1 = getCookie('world');
     var cookie1 = getCookie('foo');
     ```

2. **Getting All Cookies at Once (`all`) - Test Name: `all`**
   - **Definition:** This method retrieves all the cookies at once using the `all` function, which first calls the `getCookies` function to parse the `document.cookie` string into an object. Individual cookie values can then be accessed from this object.
   - **Example Code:**
     ```javascript
     var cookies = all();
     var cookie1= cookies['foo'];
     var cookie2= cookies['hello'];
     var cookie3= cookies['world'];
     var cookie4= cookies['foo'];
     ```

### Pros and Cons of Each Approach

- **`getCookie` Approach (Individual Retrieval)**
  - **Pros:**
    - Simplicity: The code is straightforward and easy to understand. Each cookie can be accessed independently.
    - Minimal Memory Usage: Only the necessary cookie is processed, which can be advantageous if the number of cookies is small.
  - **Cons:**
    - Performance Inefficiency: Each call to fetch a cookie involves parsing the cookie string from scratch every time, which can lead to longer execution times as the number of cookies increases.
    - More Repetitive Code: When multiple cookies are needed, the code can become verbose or repetitive.

- **`all` Approach (Bulk Retrieval)**
  - **Pros:**
    - Performance Efficiency: All cookies are parsed once, which can significantly enhance performance when multiple cookies need to be accessed, as subsequent accesses to the cookies use a pre-parsed object.
    - Cleaner Code: This approach reduces redundancy when accessing multiple cookies since all are retrieved in one go.
  - **Cons:**
    - Memory Consumption: Retaining all cookies in an object might consume more memory, particularly if many cookies are present.
    - Initial Overhead: There’s a slight overhead from parsing all cookies, which may not be justified if only one or two cookies are needed.

### Libraries and JavaScript Features Used

- **Custom Functions:**
  - The benchmark uses custom functions (`getCookies`, `all`, `getCookie`, and `decodeRFC`) to manage cookie access. These are designed to encapsulate the logic of cookie handling effectively.
  
- **`decodeURIComponent`:**
  - This built-in JavaScript function is leveraged to decode cookie values that may be URL-encoded, ensuring that the retrieved cookie values are usable in their intended format.
  
- **Regular Expressions:**
  - The function `getCookies` utilizes a regular expression to parse the `document.cookie` string, allowing for the extraction of key-value pairs efficiently.

### Alternatives

Other alternatives and libraries for managing cookies in JavaScript include:

- **Cookies Library (e.g., js-cookie):** A popular library that simplifies cookie management with an easy-to-use API. It abstracts away the complexity of cookie parsing and provides a more declarative interface for getting, setting, and removing cookies.
  
- **Local Storage and Session Storage:** For scenarios where cookies are used primarily for storing user session data, alternatives like `localStorage` and `sessionStorage` can serve as more efficient options, particularly for storing larger amounts of data.
  
- **Contextual Decoding:** If cookies contain complex or structured data (like JSON), using libraries for serialization and deserialization (e.g., JSON.stringify and JSON.parse) post retrieval could be more robust than raw cookie strings.

### Conclusion

The benchmark presents a practical comparison of cookie access strategies in JavaScript, considering the performance implications of each approach. Understanding the trade-offs between simplicity and efficiency allows software engineers to make informed choices suited to their application's needs, optimizing for either direct or bulk cookie access depending on their use case.

Latest run results:

Run details: (Test run date: 29 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 Edg/128.0.0.0

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
gc	211140.5 Ops/sec
all	145688.2 Ops/sec

Related benchmarks:

seperate getcookie vs all cookies (with decode) (version: 0)

Comparing performance of: gc vs all

Created: 29 days ago by: Guest

Jump to the latest result

gc

all

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 29 days ago):