Benchmark: create class instances check method arrow vs bind vs no-bind

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

class ArrowMethod {
    constructor() {

    }
    method = () => {}
}
class BindMethod {
    constructor() {
        this.method.bind(this)
    }
    method() {}
}
class NoBind {
    constructor() {

    }
    method() {}
}
const n = new NoBind()
const a = new ArrowMethod()
const b = new BindMethod()

Tests:

create 1000 instances call arrow method
for (let i=0;i<1000;i++){ new ArrowMethod().method() }
create 1000 instances call bind method
for (let i=0;i<1000;i++){ new BindMethod().method() }
create 1000 instances call no bind method
for (let i=0;i<1000;i++){ new NoBind().method() }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
create 1000 instances call arrow method
create 1000 instances call bind method
create 1000 instances call no bind method

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
create 1000 instances call arrow method	588987.2 Ops/sec
create 1000 instances call bind method	1250095.5 Ops/sec
create 1000 instances call no bind method	1522311.1 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 3 months ago):

LLMs can make mistakes. Check important info.

The benchmark defined in the provided JSON examines the performance differences between three different ways of defining and calling class methods in JavaScript: using an arrow function, using the `bind` method, and a standard method without any binding. Here's a breakdown of the approaches, their pros and cons, and alternative methods.

### Approaches Compared

1. **Arrow Method (`ArrowMethod`)**:
   - **Implementation**: Defined as a class instance method using an arrow function.
   - **Syntax**:
     ```javascript
     class ArrowMethod {
         method = () => {};  // Arrow function
     }
     ```
   - **Pros**:
     - `this` binding: Arrow functions do not have their own `this` context; they capture the `this` value of the enclosing lexical context. This means that `this` within the method always refers to the instance of the class.
     - Concise syntax is often easier to read, especially for simple methods.
   - **Cons**:
     - Arrow functions can be less performant in scenarios where a method is called frequently because each call will create a new method instance, leading to higher memory usage.
     - Cannot be used as constructors.

2. **Bind Method (`BindMethod`)**:
   - **Implementation**: Standard class method defined normally but binds `this` context to the method within the constructor.
   - **Syntax**:
     ```javascript
     class BindMethod {
         constructor() {
             this.method = this.method.bind(this);  // Binding `this` context
         }
         method() {}
     }
     ```
   - **Pros**:
     - Standard method definition: Can be called as constructor functions and used in subclasses.
     - `this` is properly bound, ensuring correct context in callbacks or when passed as a reference.
   - **Cons**:
     - Requires explicit binding in the constructor, leading to additional overhead.
     - Slightly more verbose compared to arrow functions.

3. **No Bind Method (`NoBind`)**:
   - **Implementation**: Standard class method defined without explicit binding.
   - **Syntax**:
     ```javascript
     class NoBind {
         method() {}
     }
     ```
   - **Pros**:
     - Simple syntax: It is clear and straightforward to define.
     - No additional overhead from binding.
   - **Cons**:
     - Can lead to issues with `this` context if the method is passed around or used as a callback (will refer to the global context or be `undefined` in strict mode).

### Performance Test Cases

The tests assess the execution speed for each approach by creating 1000 instances of each class and calling their respective methods. The data from the latest benchmark shows the following executions per second for each test case:

- **No Bind Method**: 1,522,311.125 executions/second (fastest)
- **Bind Method**: 1,250,095.5 executions/second (intermediate)
- **Arrow Method**: 588,987.1875 executions/second (slowest)

### Considerations and Alternatives

- **Considerations**: 
  - The performance differences highlight trade-offs between simplicity (No Bind) and reliability (BindMethod).
  - Arrow methods provide reliable context but can be less efficient when created repeatedly.

- **Alternatives**:
  - **Using Classes vs. Factory Functions**: Depending on the use case, factory functions might be more efficient, especially in scenarios where instance methods don't require inheritance or long-term state management.
  - **Static Methods**: If the entities can be designed without individual instance state, static methods eliminate instance creation overhead entirely.
  - **Using Prototypes**: Instead of class-based syntax, methods can be added directly to the constructor's prototype, which saves memory for many instances.

In conclusion, the choice between these methods ultimately depends on specific use case requirements, such as performance demands, code clarity, and the need for maintaining the correct context for `this`. Each method has its place in JavaScript, and understanding these differences is crucial for writing performant and maintainable code.

Related benchmarks:

create class instances check method arrow vs bind vs no-bind (version: 1)

measure the performance of a class method defined with arrow function vs bind vs no-bind

Comparing performance of: create 1000 instances call arrow method vs create 1000 instances call bind method vs create 1000 instances call no bind method

Created: 3 months ago by: Guest

Jump to the latest result

create 1000 instances call arrow method

create 1000 instances call bind method

create 1000 instances call no bind method

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 3 months ago):