Consolidate functions into a unified method through the implementation of TypeScript Generics

How can I refactor this code using TypeScript generics? I have three methods here, and I would like to consolidate them into a single method that accepts type T in order to avoid redundant code.

 
private initializeComponentIframe<T>(componentType: Type<T>) {
    const componentFactory = this.componentFactoryResolver.resolveComponentFactory(componentType);
    this.dynamicIframeContent.clear();
    const dynamicComponent = <T>this.dynamicIframeContent.createComponent(componentFactory).instance;
    dynamicComponent.facade = this;
    dynamicComponent.url = this.url;
    dynamicComponent.initialize(); 
}

this.initializeComponentIframe(BlueComponent);
this.initializeComponentIframe(BlackComponent);
this.initializeComponentIframe(GreenComponent);    

Answer №1

When the parameter and generic are identical, there is no need for a generic; you can simply use the parameter instead.

 type IframeComponents = BlueComponent | BlackComponent | Green Component


    private initializeIfame(component: IframeComponents) {
        const componentFactory = this.componentFactoryResolver.resolveComponentFactory(component);
        this.dynamicIframeContent.clear();
        const dynamicComponent = <component>this.dynamicIframeContent.createComponent(componentFactory).instance;
        dynamicComponent.facade = this;
        dynamicComponent.url = this.url;
        dynamicComponent.initialize();
    }

To call the function with the appropriate component:

this.initializeIfame(BlueComponent)

If you do need to specify what is being returned, you can utilize a generic in the following way:

private initializeIfame<T>(component: IframeComponents): T {
        const componentFactory = this.componentFactoryResolver.resolveComponentFactory(component);
        this.dynamicIframeContent.clear();
        const dynamicComponent = <T>this.dynamicIframeContent.createComponent(componentFactory).instance;
        dynamicComponent.facade = this;
        dynamicComponent.url = this.url;
        dynamicComponent.initialize();
        // optional return
        return component;
}
this.initializeIfame<BlueComponent>(BlueComponent)

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