Benchmark: IIFE vs Normal Fixed 2

Script Preparation code:

var iife = (() => {
  return window.location !== window.parent.location;
})();

var normal = () => {
  return window.location !== window.parent.location;
}

Tests:

iife
console.log(iife)
normal
console.log(normal())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
iife
normal

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark on MeasureThat.net compares the performance of two ways to execute JavaScript code: using an Immediately Invoked Function Expression (IIFE) and a regular function expression.

Let's break down what's happening:

**The Code:**

* **IIFE (`iife`):** 
   ```javascript
   (() => {
     return window.location !== window.parent.location;
   })(); 
   ```
   This is an IIFE. The code within the parentheses is executed immediately when the code defining it is encountered. It checks if the current window's location is different from its parent window's location (a common way to detect if a page is in an iframe).

* **Regular Function (`normal`):**
   ```javascript
   () => {
     return window.location !== window.parent.location;
   }
   ```
   This defines a regular function expression that also performs the same location comparison.

**The Test:**  Each test case simply logs the result of either `iife` or the `normal()` function to the console.

**Why Compare Them?**

Performance: The benchmark aims to find out if there's a measurable difference in execution speed between these two approaches.

**Pros and Cons:**

* **IIFE (Advantages):**
    * **Scoping:**  They create their own private scope, helping avoid potential name collisions with other code.
    * **Cleanness:** Can make code more organized and readable by grouping related logic.
* **IIFE (Disadvantages):** 
    * **Overkill for Simple Tasks:** For very small snippets of code, the overhead of creating an IIFE might not be worth it.

* **Regular Function (Advantages):**
    * **Simpler Syntax:** Can be more concise than an IIFE.
    * **Less Overhead:** Potentially faster if the function is extremely simple and doesn't require scoping. 
* **Regular Function (Disadvantages):**
    * **Name Collisions:** More susceptible to naming conflicts with other code in your project.

**Other Considerations:**

* **Browser/Environment:** Performance can vary significantly across different browsers, operating systems, and hardware. That's why benchmarks often include multiple test runs and data from various environments.

**Alternatives:**
There are other ways to achieve similar functionality, such as:

* Using a `function` declaration instead of an expression. Declarations have slightly different scoping rules but are generally considered cleaner for larger blocks of code.

Let me know if you have any more questions!

Related benchmarks:

IIFE vs Normal Fixed 2 (version: 0)

Comparing performance of: iife vs normal

Created: 6 years ago by: Guest

Jump to the latest result

iife

normal

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):