Benchmark: Anonymous Function in Loop

Script Preparation code:

function doSomething(x) {
  console.log(x);
}

Tests:

A
for(var i=0; i < 10; i++) { (function(someValue) { console.log(someValue); })(i); }
B
for(var i=0; i < 10; i++) { doSomething(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
A
B

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0

Browser/OS: Firefox 122 on Windows

View result in a separate tab

Test name	Executions per second
A	4820.6 Ops/sec
B	4807.9 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark, titled "Anonymous Function in Loop," measures the performance of two approaches: creating an anonymous function on each iteration using an immediate invoked function expression (IIFE) (`(function(someValue) { ... })(i);`) and calling a named function `doSomething(i)` with the same loop.

**Options Compared**

There are two options being compared:

1. **Anonymous Function IIFE**: This approach creates a new, self-executing anonymous function on each iteration using an IIFE. The function takes one argument `someValue` which is set to the current value of `i`.
2. **Named Function**: This approach calls a pre-defined named function `doSomething(i)` with the same loop.

**Pros and Cons**

1. **Anonymous Function IIFE**:
	* Pros: Reduces memory allocation and garbage collection overhead since each function is immediately executed.
	* Cons: Requires more CPU instructions to create and execute each function, potentially leading to slower performance due to increased overhead.
2. **Named Function**:
	* Pros: Reuses the existing `doSomething` function definition, reducing creation overhead.
	* Cons: Requires more memory allocation and garbage collection since a new object is created on each iteration.

**Library Usage**

There is no explicit library usage mentioned in this benchmark.

**Special JavaScript Features or Syntax**

This benchmark uses:

1. **Immediately Invoked Function Expression (IIFE)**: A syntax feature that creates a new function immediately when executed.
2. **Named Function**: A general programming concept where functions are assigned to a name.

**Alternative Approaches**

Other alternatives could include:

1. **Lambda Functions**: An alternative approach using lambda expressions (`() => { console.log(i); }`) instead of IIFE.
2. **Closure**: Using closures, which can encapsulate the `i` variable and avoid creating new functions on each iteration.
3. **Just-In-Time (JIT) Compilation**: Compiling the code at runtime to native machine code using a JIT compiler.

These alternative approaches would require modifications to the benchmark script and might not be directly comparable without additional considerations.

Related benchmarks:

Anonymous Function in Loop (version: 0)

Comparing performance of: A vs B

Created: 8 years ago by: Guest

Jump to the latest result

A

B

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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