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Anonymous Function in Loop
(version: 0)
Comparing performance of:
A vs B
Created:
8 years ago
by:
Guest
Go to the latest result
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>
Run tests (2)
Previous results
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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
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<iframe src="https://measurethat.net/Embed?id=501416" width="100%" height="500px"></iframe>
A
5K/s
B
5K/s
View exact numbers
Test name
Executions per second
✓
A
4,821 Ops/sec
B
4,808 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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