Benchmark: IIFE vs IF - MeasureThat.net

Tests:

If
let a = 5; let b = 10; let c; if (a > b) { c = a; } else { c = b; }
IIFE
(() => { let a = 5; let b = 10; if (a > b) { return a; } else { return b; } })()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
If
IIFE

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Linux

View result in a separate tab

154.7M/s

IIFE

149.4M/s

View exact numbers

Test name	Executions per second
✓ If	154,714,608 Ops/sec
IIFE	149,419,280 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of different JavaScript syntax and features is crucial for developers, as it can significantly impact application performance and user experience.

Let's break down the provided benchmark definition:

**Benchmark Definition:**

The benchmark compares two JavaScript constructs: IIFE (Immediately Invoked Function Expression) and traditional `if` statement. The script preparation code is empty, which means that only the actual test cases will be executed.

**Options compared:**

Two options are being compared:

1. **IIFE**: An immediately invoked function expression is a syntax that wraps a function in parentheses and executes it immediately after declaration.
2. **Traditional `if` statement**: A traditional `if` statement checks a condition and executes code based on the result.

**Pros and Cons of each approach:**

*   **IIFE:**
    *   Pros:
        *   Encapsulation: IIFE allows for better encapsulation, making it easier to pass data between functions without exposing external variables.
        *   Closure: IIFE creates a new scope, allowing functions to retain their variable bindings even after the outer function has returned.
    *   Cons:
        *   Complexity: Adding parentheses and invoking immediately can make code more complex and harder to read.
        *   Performance: Creating an additional function call can incur overhead in terms of performance.
*   **Traditional `if` statement:**
    *   Pros:
        *   Simplicity: Traditional `if` statements are straightforward and easy to understand.
        *   Performance: Without the overhead of creating a new function, traditional `if` statements can be faster than IIFE.
    *   Cons:
        *   Variable access: In traditional `if` statements, variables must be passed as arguments or declared in the outer scope.

**Library usage:**

The benchmark does not use any external libraries. The test cases rely on native JavaScript features.

**Special JS feature/syntax:**

Neither of the provided benchmark definitions uses special JavaScript features like async/await, Promises, or modern methods like `for...of` loops.

**Other alternatives:**

Alternatives to comparing IIFE and traditional `if` statements might include:

*   **Function expressions**: Instead of IIFE, you could compare regular function expressions with traditional `if` statements.
*   **Lambda functions**: By using lambda functions, which are essentially small anonymous functions, you can compare performance differences between different syntax approaches.

For your understanding, here is a basic benchmark preparation code in JavaScript:

```javascript
function createBenchmark(benchmarkDefinition) {
  return () => {
    const vm = new V8() // Create a V8 engine instance to run the benchmark.
    let script = benchmarkDefinition;
    for (let i = 0; i < 10000; i++) { // Run the benchmark 10,000 times
      vm.runScript(script);
    }
  };
}

function prepareBenchmark(script) {
  return `(${script})()`;
}

// Example usage:
const ifBenchmark = createBenchmark(`if (${5} > ${10}) {{${5}}}`)
const iifeBenchmark = prepareBenchmark(`(() => {${5} ;${10} ;}`)

console.log(ifBenchmark(), iifeBenchmark())
```

This example uses a basic V8 engine instance to run the script 10,000 times. Keep in mind that real-world benchmarks might need more complex code and considerations.

Hope this explanation was helpful!

IIFE vs IF (version: 0)

Comparing performance of: `If vs IIFE`

Created: 3 years ago by: Guest

Go to the latest result

If

IIFE

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

IIFE vs IF (version: 0)

Comparing performance of: If vs IIFE

Created: 3 years ago by: Guest

Go to the latest result

If

IIFE

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `If vs IIFE`