Benchmark: benchmark of getter vs get function

Script Preparation code:

class Foo {
    constructor() {
      this.bbb = 100;
    }
    get bar() {
       return this.bbb; 
   }
   
   getBar() {
       return this.bbb;
  }
}

var foo = new Foo();
var count = 100000;
var bar;

Tests:

getter
for(let i=0; i< count; i++) { bar = foo.bar; }
get function
for(let i=0; i< count; i++) { bar = foo.getBar(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getter
get function

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
getter	112.2 Ops/sec
get function	112.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark that compares two different approaches to accessing a property on an object: using a getter function (`get bar()` in the script preparation code) and using a traditional get method (`bar = foo.getBar();` in the individual test cases).

**Script Preparation Code**

The `Script Preparation Code` section defines a class `Foo` with a constructor that initializes an object `this.bbb` to 100. The `get bar()` getter function is also defined, which returns the value of `this.bbb`. Additionally, a variable `foo` is created by instantiating the `Foo` class, and another variable `bar` is declared.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **"getter"`**: This test case executes a loop 100,000 times, assigning the result of `foo.bar` to `bar` in each iteration.
2. **"get function"`**: This test case also executes a loop 100,000 times, but assigns the result of `foo.getBar()` to `bar` in each iteration.

**Libraries and Features**

In this benchmark, no specific libraries are used beyond the built-in JavaScript features and the `class` keyword. However, it's worth noting that using getters can provide additional benefits like automatic property descriptor manipulation and improved encapsulation.

**Options Compared**

The two options being compared are:

1. Using a getter function (`get bar()`).
2. Using a traditional get method (`bar = foo.getBar();`).

**Pros and Cons of Each Approach**

**Getter Function (get bar())**

Pros:

* Encapsulation: getters provide a way to control access to properties, which can help encapsulate data and prevent external interference.
* Automatic property descriptor manipulation: getters can be used to define the behavior of a property, such as validating its value or performing calculations on it.

Cons:

* Performance overhead: accessing a getter function can introduce a slight performance penalty compared to direct property access.
* Complexity: defining getters can add complexity to codebase if not done carefully.

**Traditional Get Method (bar = foo.getBar())**

Pros:

* Performance: accessing a get method is generally faster than accessing a getter function, as it doesn't involve the overhead of method invocation and argument checking.
* Simplicity: using traditional get methods can make code easier to read and maintain, especially for simple cases.

Cons:

* Lack of encapsulation: direct property access bypasses any control provided by getters, making it harder to validate or manipulate property values.
* Limited flexibility: traditional get methods cannot be used to define complex behavior like getter functions.

**Other Considerations**

When deciding between these two approaches, consider the following factors:

* Performance requirements: if speed is critical, a traditional get method might be preferable. However, for most cases, the performance difference will be negligible.
* Code readability and maintainability: using getters can make code more modular and easier to understand, but may add complexity for simple use cases.

**Alternatives**

If you're looking for alternatives to this benchmark, consider:

* Testing other aspects of getter function behavior, such as:
	+ Property descriptor manipulation
	+ Argument checking and validation
	+ Error handling and propagation
* Evaluating the performance of other accessors, like `in` operators or bracket notation (`bar in foo`, `foo['bar']`)
* Comparing different JavaScript versions or engines' behavior regarding getter functions

These additional tests can provide a more comprehensive understanding of getter function usage and help identify potential issues or areas for improvement.

Related benchmarks:

benchmark of getter vs get function (version: 3)

Comparing performance of: getter vs get function

Created: 3 years ago by: Registered User

Jump to the latest result

getter

get function

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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