Utilizing ES6 JavaScript for Creating Static Methods and Angular 2 Services

Question

Utilizing ES6 JavaScript for Creating Static Methods and Angular 2 Services

During the development of an Angular 2 app involving multiple calculation services, I encountered some interesting questions:

Is it beneficial to use static in an Angular service provided on the application level? Or is it unnecessary?
How does a static method impact performance when multiple objects simultaneously call the same static method hundreds of times? Is the method instantiated more than once?

Below is a snippet from the class that houses various calculation methods and is instantiated on the application level:

@Injectable()
export class FairnessService {
  constructor(){}
  private static calculateProcentValue(value: number, from: number): number {
    return (Math.abs(value) / Math.abs(from)) * 100;
  }
  public static calculateAllocationWorth(allocation: Allocation): number {
    ...
  }
}

Any insights would be greatly appreciated. Thank you.

javascript angular typescript angular2-services

Answer 1

Answer №1

Static methods of a class differ from instance methods because they are associated with the class itself, not an instance of it. These methods do not rely on the instance members of a class and typically operate on input parameters to produce a result independently.

In Angular services, static methods can be useful in certain scenarios where utilizing an instance of the service is unnecessary or undesirable, and only access to the service's methods is required. This is where static members play a role.

An example illustrating the usage of a static method defined in a service:

import { FairnessService } from './fairness.service';

export class MyComponent {

    constructor() {
        // This demonstrates accessing the static members of a class.
        // Note that we did not inject the service or manually instantiate it like: let a = new A();
        let value = FairnessService.calculatePercentValue(5, 50);
        let value2 = FairnessService.calculatePercentValue(2, 80);

        console.log(value); // => 10
        console.log(value2); // => 2.5
    }
}

Static methods have no impact on performance. Since they do not rely on any class instance, invoking these methods does not instantiate the class in any way.

For further information, refer to: http://www.typescriptlang.org/docs/handbook/classes.html

Answer 2

Static methods of a class differ from instance methods because they are associated with the class itself, not an instance of it. These methods do not rely on the instance members of a class and typically operate on input parameters to produce a result independently.

In Angular services, static methods can be useful in certain scenarios where utilizing an instance of the service is unnecessary or undesirable, and only access to the service's methods is required. This is where static members play a role.

An example illustrating the usage of a static method defined in a service:

import { FairnessService } from './fairness.service';

export class MyComponent {

    constructor() {
        // This demonstrates accessing the static members of a class.
        // Note that we did not inject the service or manually instantiate it like: let a = new A();
        let value = FairnessService.calculatePercentValue(5, 50);
        let value2 = FairnessService.calculatePercentValue(2, 80);

        console.log(value); // => 10
        console.log(value2); // => 2.5
    }
}

Static methods have no impact on performance. Since they do not rely on any class instance, invoking these methods does not instantiate the class in any way.

For further information, refer to: http://www.typescriptlang.org/docs/handbook/classes.html

Answer 3

Answer №2

Revise

After gaining a deeper understanding, I realize that static methods are accessible on a class itself rather than its instances.

If you're still confused, check out this helpful article: https://javascript.info/static-properties-methods

I also want to acknowledge seidme's insightful response.

Reworked

In the Angular application, static methods behave like global variables, functioning once for the entire instantiation. This shouldn't significantly impact performance compared to instantiating the class for each component.

I opt for static methods when I need context-independent formatting or utility operations without injecting the service and creating an instance. Having application-wide versions of these methods makes sense in certain scenarios.

Answer 4

Revise

After gaining a deeper understanding, I realize that static methods are accessible on a class itself rather than its instances.

If you're still confused, check out this helpful article: https://javascript.info/static-properties-methods

I also want to acknowledge seidme's insightful response.

Reworked

In the Angular application, static methods behave like global variables, functioning once for the entire instantiation. This shouldn't significantly impact performance compared to instantiating the class for each component.

I opt for static methods when I need context-independent formatting or utility operations without injecting the service and creating an instance. Having application-wide versions of these methods makes sense in certain scenarios.

Utilizing ES6 JavaScript for Creating Static Methods and Angular 2 Services

Answer №1

Answer №2

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