Benchmark: getter vs properties

Tests:

property
let s = 0; class A { constructor() { this.a = 0.1; Object.defineProperty(this, 'c', { get: () => 0.1, }); } get b() { return 0.1; } } const a = new A(); for (let i=0; i<10000; i++) s += a.a;
getter
let s = 0; class A { constructor() { this.a = 0.1; Object.defineProperty(this, 'c', { get: () => 0.1, }); } get b() { return 0.1; } } const a = new A(); for (let i=0; i<10000; i++) s += a.b;
define
let s = 0; class A { constructor() { this.a = 0.1; Object.defineProperty(this, 'c', { get: () => 0.1, }); } get b() { return 0.1; } } const a = new A(); for (let i=0; i<10000; i++) s += a.c;
define property
let s = 0; class A { constructor() { this.a = 0.1; Object.defineProperty(this, 'd', { value: 0.1, }); } get b() { return 0.1; } } const a = new A(); for (let i=0; i<10000; i++) s += a.d;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
property
getter
define
define property

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the benchmarking world of MeasureThat.net.

**Benchmark Overview**

The provided JSON represents four test cases, each measuring the performance difference between using getters, properties, and defining getters with values versus just using getters without assigning values.

**Options Compared**

1. **Getters**: A getter is a special method in JavaScript that allows you to implement custom access control or computation for a property of an object.
2. **Properties**: In JavaScript, properties are defined using the `Object.defineProperty()` method and can be either data descriptors (with getters/setters) or accessor properties (without getters/setters).
3. **Define Properties with Values**: This option involves defining properties with values using `Object.defineProperty()`, but without specifying a getter function.

**Pros and Cons of Each Approach**

1. **Getters**:
	* Pros: Provides fine-grained control over property access, can be used for data transformation or validation.
	* Cons: Can introduce additional overhead due to the extra method call, might not be suitable for simple data storage needs.
2. **Properties** (data descriptors):
	* Pros: Allows for both getter and setter functions, can provide better performance than getters since it avoids an extra method call.
	* Cons: Requires defining a getter function, which might add complexity if not used carefully.
3. **Define Properties with Values**:
	* Pros: Simpler to use than properties, as it doesn't require defining a getter function.
	* Cons: Does not provide the same level of control as getters or properties, and values are hardcoded.

**Other Considerations**

In general, when deciding between these options, consider the specific requirements of your project:

* If you need fine-grained control over property access and can afford the extra overhead, use getters.
* If simplicity is key and you don't require getter/setter functionality, define properties with values might be sufficient.
* If you're storing simple data and want to avoid defining getter functions, properties (data descriptors) are a good middle ground.

**Special JS Feature or Syntax**

None mentioned in the provided JSON. However, it's worth noting that MeasureThat.net is designed for testing JavaScript performance, so the focus is on executing test cases, not showcasing advanced JavaScript features.

Now, let's take a look at some alternative approaches:

* **Using `Object.create()`**: This method creates a new object based on an existing one, which can be useful for prototypal inheritance.
* **Defining getters using arrow functions**: Instead of defining getters as traditional methods, you can use arrow functions to simplify the syntax.
* **Using `const` properties**: If you're working with immutable data, consider using `const` properties instead of getter/setter combinations.

Keep in mind that these alternatives are not directly related to the options compared in this benchmark, but they demonstrate the flexibility and expressiveness of JavaScript.

Related benchmarks:

getter vs properties (version: 0)

Comparing performance of: property vs getter vs define vs define property

Created: 3 years ago by: Guest

Jump to the latest result

property

getter

define

define property

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):