Using TypeScript and Angular to retrieve a service instance within a static function

I have a situation where I am trying to access an instance property within a static method in my utility class. Here is an example code snippet:

export class DataUtil {
    constructor(public core:CoreStructureService){
    }

    static fetchContact(id:string):ContactModel{
        for(let contact of this.core.contactList){
            if(contact.contactId == id)
                return contact;
        }
    }
}

The issue here is that the line `this.core.contactList` inside the `for` statement is causing a compilation error since we cannot refer to instance properties within a static method using `this`. So, how can we resolve this problem?

Answer №1

Posting this as an answer despite the risk to my reputation.

Avoid using core service methods in a static method. This is not recommended and may be why you are encountering compiler errors.


Consider making your fetchContact method an instance method instead of static.

export class DataUtil {
    constructor(public core:CoreStructureService){

    }

    fetchContact(id:string):ContactModel{
        for(let contact of this.core.contactList){
        if(contact.contactId == id)
            return contact
        }
    }

}

It is possible to find a workaround, albeit in a messy and unreliable manner. I choose not to elaborate on it purposely.

Remember, attempting to do a bad thing will only lead to complications.

Answer №2

Imagine if DataUtil was a service injected by React instead of Angular. In this scenario, the service would only be destroyed once the corresponding injector is also removed. It's unlikely that you'll encounter performance issues due to instantiating classes. Start by using a regular service and only revisit this issue if performance becomes a concern.

For more information, check out the React documentation.

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