Benchmark: Function vs inline set property

Script Preparation code:

var c = {};

var f = {
	set_var: (c, key, value) => {
  		// (c._?c._:c._={})[key] = value;
      	if(!c.var) c.var = {};
      	c.var[key] = value;
	}
};

Tests:

Function
f.set_var(c, "foo", "bar");
Inline
(c._?c._:c._={}).foo = "bar";

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Function
Inline

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Function	15844759.0 Ops/sec
Inline	15857404.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking JSON and test cases to understand what is being tested.

**Benchmark Definition JSON**

The benchmark definition represents a JavaScript microbenchmark that compares two approaches:

1. **Inline Set Property**: This approach uses an inline assignment to set a property on an object.
2. **Function Call**: This approach calls a named function `set_var` to set a property on the same object.

The script preparation code for both approaches is provided, which shows how the variables and objects are defined and initialized.

**Script Preparation Code**

For the **Inline Set Property** approach:
```javascript
var c = {};
var f = {
  set_var: (c, key, value) => {
    if (!c.var) c.var = {};
    c.var[key] = value;
  }
};
```
This code defines an object `c` and a function `set_var` that takes three arguments: the object `c`, the property key, and the new value. The function checks if the `var` property exists on the `c` object, and if not, creates it as an empty object. Then, it sets the specified property with the given value.

For the **Function Call** approach:
```javascript
var c = {};
var f = {
  set_var: (c, key, value) => {
    // ...
  }
};
```
This code is identical to the inline approach, except that the `set_var` function is called instead of the inline assignment.

**Individual Test Cases**

The test cases compare the execution time of each approach:

1. **Function**: Calls the `set_var` function with the object `c`, key `"foo"`, and value `"bar"` as arguments.
2. **Inline**: Uses an inline assignment to set the property on the same object.

**Library Usage**

There is no explicit library usage in this benchmarking JSON, but it's worth noting that some libraries like Lodash or Underscore.js might be used for similar operations.

**Special JS Feature/Syntax**

Neither of these approaches utilizes any special JavaScript features or syntax. They are straightforward, functional code snippets that test the execution time of different assignment methods.

Now, let's discuss the pros and cons of each approach:

* **Inline Set Property**:
	+ Pros: Might be optimized by the interpreter or compiler.
	+ Cons: Can lead to longer compilation times if not properly inlined.
* **Function Call**:
	+ Pros: Allows for easy modification or extension of the assignment logic.
	+ Cons: May incur a slight performance overhead due to function call and lookup.

Considering these factors, alternative approaches could include:

1. Using `Object.assign()` to set properties on an object.
2. Utilizing `Proxy` objects to create dynamic properties.
3. Comparing performance with different property access patterns (e.g., dot notation vs bracket notation).
4. Incorporating additional tests for edge cases or specific browsers.

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

Related benchmarks:

Function vs inline set property (version: 0)

Comparing performance of: Function vs Inline

Created: 2 years ago by: Guest

Jump to the latest result

Function

Inline

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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