Benchmark: optional function call

Script Preparation code:

var total = 0;
var f1;
var f2 = function() {
  total++;
};

Tests:

if real
if (f2) f2();
anonymous real
(f2 || Function)();
if fake
if (f1) f1();
anonymous fake
(f1 || Function)();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if real
anonymous real
if fake
anonymous fake

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/602.4.8 (KHTML, like Gecko) Version/10.0.3 Safari/602.4.8

Browser/OS: Safari 10 on Mac OS X 10.12.3

View result in a separate tab

Test name	Executions per second
if real	2421643.2 Ops/sec
anonymous real	3314711.8 Ops/sec
if fake	10622033.0 Ops/sec
anonymous fake	180796.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into explaining the provided benchmark.

**Benchmark Definition JSON**

The benchmark definition json represents a JavaScript microbenchmark that tests the behavior of an optional function call. Here's what's being tested:

* The `Script Preparation Code` sets up two variables, `total` and `f1`, which are used in the test cases.
* The `Html Preparation Code` is empty, indicating that no HTML code needs to be executed before running the tests.

**Test Cases**

There are four test cases that compare different approaches to optional function calls:

1. **"if real"`**: Tests if the `f2` function is defined and called using an `if` statement.
2. **"anonymous real"`**: Tests if a callable object (i.e., a function) is returned or assigned to `f2` using the OR operator (`||`). This ensures that even if `f2` isn't defined, a callable object will be created automatically.
3. **"if fake"`**: Tests if the `f1` variable is defined and called using an `if` statement.
4. **"anonymous fake"`**: Similar to the previous point, tests if a callable object (i.e., a function) is returned or assigned to `f1` using the OR operator (`||`).

**Pros and Cons of Different Approaches**

* **Using `if` statements (`"if real"` and `"if fake"`):**
	+ Pros: Easy to read and understand, as it explicitly checks if a variable is defined.
	+ Cons: May lead to unnecessary function calls or computations if the condition is false.
* **Using OR operator (`"anonymous real"` and `"anonymous fake"`):**
	+ Pros: Reduces overhead by avoiding unnecessary function calls or computations when the variable is not defined. It also allows for default values or callable objects to be assigned to variables.
	+ Cons: May lead to confusion if not used carefully, as it can hide undefined behavior.

**Libraries and Special JavaScript Features**

There are no libraries mentioned in the benchmark definition JSON. However, note that some modern browsers have features like `optional chaining` (?.), which allows for a more concise way of accessing properties or calling methods on an object without explicitly checking if they exist:

```javascript
f1?.() // equivalent to "if real" approach
(f2 || Function)() // equivalent to "anonymous real" approach
```

**Alternatives**

Other alternatives for testing optional function calls might include:

* Using a `default` parameter or an arrow function with a default value.
* Employing early returns or conditional statements with a return value.
* Utilizing the `??` operator (optional chaining) in newer JavaScript versions.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

Related benchmarks:

optional function call (version: 0)

Comparing performance of: if real vs anonymous real vs if fake vs anonymous fake

Created: 7 years ago by: Guest

Jump to the latest result

if real

anonymous real

if fake

anonymous fake

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):