Benchmark: IIFE vs Normal Fixed

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:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36

Browser/OS: Chrome 80 on Linux

View result in a separate tab

Test name	Executions per second
iife	38726.2 Ops/sec
normal	33206.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark is testing two approaches to compare their performance:

1. **IIFE (Immediately Invoked Function Expression)**: An IIFE is a function that is invoked immediately after its definition. In this case, `iife` is defined as an anonymous function that returns the value of `window.location !== window.parent.location`.
2. **Normal Fixed**: This approach uses a regular function that also checks if `window.location !== window.parent.location`.

**Options Compared**

The two options being compared are:

* IIFE: `console.log(iife)`
* Normal Fixed: `console.log(normal)`

These two approaches differ in how they invoke the function and access its return value. In both cases, the function returns a boolean value indicating whether the current page is not hosted within another HTML document.

**Pros and Cons**

Here are some pros and cons of each approach:

IIFE:

Pros:

* Encapsulation: IIFE can encapsulate variables and functions, making them more private.
* Scoping: IIFE creates a new scope for the function, which can be beneficial in some cases.

Cons:

* Complexity: IIFE can add complexity to code, especially when used excessively.
* Performance: Some argue that IIFE can introduce additional overhead due to the creation of a new function object.

Normal Fixed:

Pros:

* Simplicity: Regular functions are often more straightforward and easier to understand.
* Performance: In some cases, regular functions might be faster because they don't require the creation of a new function object.

Cons:

* Global scope: By using a regular function, it's harder to keep variables private.
* Overhead: Creating an unnecessary `this` context or reusing existing contexts can introduce overhead.

**Library Usage**

The benchmark uses the `window.location` property, which is part of the Web API. This property provides information about the current web page, including its location (i.e., the URL).

No specific library is used in this benchmark.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark definition. The code uses standard ES6 features and the `window` object.

Now, let's consider some alternative approaches:

* **Closure**: Instead of using IIFE, you could use a closure to encapsulate the function.
* **Lambda functions**: You could rewrite the function as a lambda function (e.g., `(location) => location !== parent.location`) for additional conciseness.
* **Arrow functions with `bind`**: You could also use arrow functions and bind the `this` context using `bind()` to achieve similar results.

Keep in mind that these alternatives might not necessarily change the performance characteristics of the benchmark, but they can provide different trade-offs in terms of code complexity, readability, or maintainability.

Related benchmarks:

IIFE vs Normal Fixed (version: 0)

Comparing performance of: iife vs normal

Created: 4 years ago by: Guest

Jump to the latest result

iife

normal

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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