Benchmark: iife operator speed

HTML Preparation code:

<!--your preparation HTML code goes here-->

Tests:

void
for(let i = 10; i--;)void function(){console.log(i)}()
delete
for(let i = 10; i--;)delete function(){console.log(i)}()
typeof
for(let i = 10; i--;)typeof function(){console.log(i)}()
+Plus
for(let i = 10; i--;)+function(){console.log(i)}()
-Negation
for(let i = 10; i--;)-function(){console.log(i)}()
~Not
for(let i = 10; i--;)~function(){console.log(i)}()
!Not
for(let i = 10; i--;)!function(){console.log(i)}()
parenthesis
for(let i = 10; i--;)(function(){console.log(i)}())
comma
for(let i = 10; i--;)1,function(){console.log(i)}()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
void
delete
typeof
+Plus
-Negation
~Not
!Not
parenthesis
comma

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 131 on Android

View result in a separate tab

Test name	Executions per second
void	6561.7 Ops/sec
delete	6904.4 Ops/sec
typeof	6727.2 Ops/sec
+Plus	7005.2 Ops/sec
-Negation	6595.9 Ops/sec
~Not	6167.8 Ops/sec
!Not	5913.0 Ops/sec
parenthesis	6375.4 Ops/sec
comma	6029.2 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 3 months ago):

LLMs can make mistakes. Check important info.

The benchmark titled "iife operator speed" tests the performance of various operators in the context of Immediately Invoked Function Expressions (IIFEs) in JavaScript. Each test case consists of a for-loop that iterates down from 10 to 0, invoking an IIFE that logs the current value of the loop index, `i`. The different approaches involve using different operators or syntaxes before the IIFE call.

### Tested Options

Here’s a breakdown of the test cases and their corresponding approaches:

1. **`void`**: `void function(){console.log(i)}()`
   - **Description**: The `void` operator evaluates an expression and discards its return value, resulting in undefined.
   - **Pros**: This is useful when you want to prevent returning any value affecting the surrounding code.
   - **Cons**: It is less commonly used, which may impact readability for some developers.

2. **`delete`**: `delete function(){console.log(i)}()`
   - **Description**: The `delete` operator is typically used to remove a property from an object; in this case, it attempts to delete the function expression.
   - **Pros**: Shows an exotic use case of `delete`.
   - **Cons**: Using `delete` on functions can lead to confusion, and it’s not a typical usage pattern.

3. **`typeof`**: `typeof function(){console.log(i)}()`
   - **Description**: The `typeof` operator returns a string that indicates the type of the unevaluated operand.
   - **Pros**: Provides type-checking capabilities.
   - **Cons**: Inefficient for the use case since the purpose is not type-checking.

4. **`+` (Plus)**: `+function(){console.log(i)}()`
   - **Description**: The unary plus operator attempts to convert the operand to a number.
   - **Pros**: Commonly used to convert values to numbers.
   - **Cons**: Confusing in the context of invoking a function; likely not the intended use.

5. **`-` (Negation)**: `-function(){console.log(i)}()`
   - **Description**: The unary negation operator converts the operand to a number and negates it.
   - **Pros**: Similar to the plus; converts to a number but makes it negative.
   - **Cons**: Could affect readability, as the intent is to invoke a function, not perform a negation.

6. **`~` (Bitwise Not)**: `~function(){console.log(i)}()`
   - **Description**: The bitwise NOT operator inverts the bits of the operand.
   - **Pros**: An interesting operator to test performance, but its utility here might be low.
   - **Cons**: Can confuse readers due to unexpected effects of bitwise operations.

7. **`!` (Logical Not)**: `!function(){console.log(i)}()`
   - **Description**: The logical NOT operator inverts the truthiness of the operand.
   - **Pros**: Often used in conditions to invert boolean values.
   - **Cons**: Similar to the negation operator, applying it to a function is likely misaligned with the function's purpose.

8. **`(function(){console.log(i)}())` (Parenthesis)**: Simple invocation.
   - **Description**: Directly invoking the IIFE using parentheses.
   - **Pros**: This is a standard way to create and invoke a function immediately.
   - **Cons**: None specific; this is the most common usage.

9. **`,` (Comma)**: `1,function(){console.log(i)}()`
   - **Description**: The comma operator evaluates each of its operands (from left to right) and returns the last operand's value.
   - **Pros**: Demonstrates an uncommon but valid operation.
   - **Cons**: Could confuse readers as its primary purpose is not to invoke a function.

### Performance Considerations

The benchmark results show variations in execution speeds for each operator, with the `+` operator performing the best at approximately 7005 executions per second, followed by `delete` and `typeof`. The `!` operator was the slowest, suggesting that the choice of operator can significantly impact performance, especially in iterative contexts.

### Other Alternatives

In addition to testing these specific operators, there are various alternatives to consider when invoking functions or performing operations in JavaScript. Here are a few:

- **Using Arrow Functions**: Arrow functions can sometimes provide improved syntax and readability.
- **Using Promises**: In asynchronous operations, Promises can help manage function invocations without blocking the call stack.
- **Different Loop Constructs**: Alternatives like `Array.prototype.forEach`, `Array.prototype.map`, or `while` loops could be used to invoke functions without the direct overhead of IIFEs.

These alternatives may serve different purposes beyond the scope of the IIFE, and understanding their implications on performance and readability in JavaScript is crucial for developers.

Related benchmarks:

iife operator speed (version: 1)

Comparing performance of: void vs delete vs typeof vs +Plus vs -Negation vs ~Not vs !Not vs parenthesis vs comma

Created: 3 months ago by: Guest

Jump to the latest result

void

delete

typeof

+Plus

-Negation

~Not

!Not

parenthesis

comma

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 3 months ago):