Benchmark: Adding fields to functions

Tests:

fun-assign
var f; var sum = 0; for(var i = 0; i <= 100000; i += 1) { f = function(j) { return j; }; f.name = "f" + String(i); sum += f(i); } console.log(f.name);
no-assign-named
var f; var sum = 0; for(var i = 0; i <= 100000; i += 1) { f = function f(j) { return j; }; sum += f(i); } console.log(f.name);
object-assign
var f; var sum = 0; var o = {}; for(var i = 0; i <= 100000; i += 1) { f = function f(j) { return j; }; o.name = "f" + String(i); sum += f(i); } console.log(f.name);
define-prop
var f; var sum = 0; for(var i = 0; i <= 100000; i += 1) { f = function(j) { return j; }; Object.defineProperty(f, 'name', {value: 'f' + String(i)}); sum += f(i); } console.log(f.name);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
fun-assign
no-assign-named
object-assign
define-prop

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

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Let's break down the benchmark and explain what's being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Overview**

The benchmark measures the performance of different approaches to assign a property name to a function in JavaScript. The test cases are designed to compare the execution time of four variations:

1. Assigning the `name` property directly to the function object (`fun-assign`)
2. Omitting the assignment of `name` and relying on the default behavior of the `toString()` method (`no-assign-named`)
3. Assigning a `name` property to an object using dot notation (`object-assign`)
4. Defining a getter for the `name` property using `Object.defineProperty()` (`define-prop`)

**Library Used**

The test cases use the built-in `Function` and `Object` objects in JavaScript.

**Special JS Features/Syntax**

None of the test cases utilize any special JavaScript features or syntax that would impact the execution time. The focus is on the assignment of a property name to a function object.

**Options Compared**

Here's a brief overview of each option:

1. **fun-assign**: Directly assigns the `name` property to the function object.
	* Pros: Simple and straightforward, no additional overhead.
	* Cons: May rely on the default behavior of the `toString()` method, which can vary across browsers.
2. **no-assign-named**: Omitting the assignment of `name`, relying on the default behavior of the `toString()` method.
	* Pros: No additional overhead, uses default browser behavior.
	* Cons: May not provide a consistent result across all browsers.
3. **object-assign**: Assigns the `name` property to an object using dot notation.
	* Pros: Consistent result across browsers, uses a well-established pattern.
	* Cons: Adds an extra step and potential overhead due to object creation.
4. **define-prop**: Defines a getter for the `name` property using `Object.defineProperty()`.
	* Pros: Provides a consistent result across browsers, uses a well-defined API.
	* Cons: Adds additional overhead due to property definition.

**Benchmark Results**

The latest benchmark results show that the order of execution time from fastest to slowest is:

1. **define-prop**: 5.728067398071289 ExecutionsPerSecond
2. **object-assign**: 21.422685623168945 ExecutionsPerSecond
3. **no-assign-named**: 25.331300735473633 ExecutionsPerSecond
4. **fun-assign**: 230.7982635498047 ExecutionsPerSecond

**Other Considerations**

The benchmark highlights the importance of considering the assignment of a property name to a function object in performance-critical code paths. The results suggest that using `Object.defineProperty()` to define a getter for the `name` property may be a good approach, as it provides a consistent result across browsers and adds minimal overhead.

However, the exact impact of each option on performance will depend on specific use cases and browser versions. It's essential to consider these factors when choosing an approach in real-world applications.

Related benchmarks:

Adding fields to functions (version: 0)

Comparing performance of: fun-assign vs no-assign-named vs object-assign vs define-prop

Created: 9 years ago by: Guest

Jump to the latest result

fun-assign

no-assign-named

object-assign

define-prop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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