用值填充接口属性

Question

I have an interface which I want to be populated automatically with some default data when I assign variables to it. The interface is saved in a module and I want to use it on other modules. How do I assign data to interface properties ?

 export interface NameAge { valueList : Array<{ 'Name', 'Age' }>; } 

So I create let's say some variables in multiple modules that implement this interface.
How do I assign some default value to the NameAge property. I can do it with a class containing listUsers as public static property but can't replace interface with class. Also I want the interface and the listUsers array of objects to be in the same module so I when I import the module, I get both the interface and listUsers with the default data already populated. Thanks :))

Answer 1

Interfaces will not allow you to do that.

However you can do it with classes.

class NameAge {
    public valueList: Array<{ 'Name', 'Age' }> = [{
        'Name': 'J',
        'Age': 'ABC'
    }];
}


class NameAgeChild extends NameAge {
    public child: boolean

    public adults() {
        return this.valueList.filter(v => v.Age >= 18);
    }
}

This however makes sense only if you need a class for this value (code + behaviour together) in your app.

If not, just make a constant with the your values and use it when you create new instances.