Can someone explain the meaning of this syntax in a TypeScript interface?

Question

Can someone explain the meaning of this syntax in a TypeScript interface?

Just the other day, I was trying to incorporate the observer pattern into my Angular 4 application and came across this TypeScript code snippet. Unfortunately, I'm not quite sure what it means.

Here's the code:

module Patterns.Interfaces {

    export interface IObservable {
        RegisterObserver(Observer: Patterns.Interfaces.IObserver);//What does Patterns.Interfaces.IObserver type signify?
        RemoveObserver(Observer: Patterns.Interfaces.IObserver);
        NotifyObservers();
    }
}

Any insights or assistance on this would be greatly appreciated!

angular typescript

Answer 1

Answer №1

Here's a breakdown of the code:

// The code defines a namespace called Patterns.Interfaces
module Patterns.Interfaces {
    // Inside the namespace, there is an interface called IObservable
    // It can be accessed outside this block using 'export'
    export interface IObservable {
        // An IObservable has a method named RegisterObserver.
        // It expects one parameter called 'Observer'.
        // The type of 'Observer' is Patterns.Interfaces.IObserver.
        // This parameter is required to call the method.
        // The return type is not specified explicitly, so it defaults to 'any'
        RegisterObserver(Observer: Patterns.Interfaces.IObserver);//What is the type Patterns.Interfaces.IObserver?
        
        // Similar to above
        RemoveObserver(Observer: Patterns.Interfaces.IObserver);
        
        // An IObservable includes a method called NotifyObservers.
        // It does not take any arguments.
        // The return type is not specified explicitly, so it defaults to 'any'
        NotifyObservers();
    }
}

Answer 2

Here's a breakdown of the code:

// The code defines a namespace called Patterns.Interfaces
module Patterns.Interfaces {
    // Inside the namespace, there is an interface called IObservable
    // It can be accessed outside this block using 'export'
    export interface IObservable {
        // An IObservable has a method named RegisterObserver.
        // It expects one parameter called 'Observer'.
        // The type of 'Observer' is Patterns.Interfaces.IObserver.
        // This parameter is required to call the method.
        // The return type is not specified explicitly, so it defaults to 'any'
        RegisterObserver(Observer: Patterns.Interfaces.IObserver);//What is the type Patterns.Interfaces.IObserver?
        
        // Similar to above
        RemoveObserver(Observer: Patterns.Interfaces.IObserver);
        
        // An IObservable includes a method called NotifyObservers.
        // It does not take any arguments.
        // The return type is not specified explicitly, so it defaults to 'any'
        NotifyObservers();
    }
}

Can someone explain the meaning of this syntax in a TypeScript interface?

Answer №1

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