TypeScript - 检查给定的'any'参数是否为自定义类型？

Question

I have a function template like this:

function (..., args: any) {...}

And I have a class called CreateLobbyParameter :

export class CreateLobbyParameter {
    userId: number;
    gameMode: GameMode;
}

If given any typed args parameter is not similar to CreateLobbyParameter (eg {userId: 0, gameMode: 0} , but not {userId:0} ); I wanna handle that situation.

I've tried typeof(arg as CreateLobbyParameter) , but it returns the string "object" for the parameter {userId: 0, gameMode: 0} , and not CreateLobbyParameter.

Also, arg instanceof CreateLobbyParameter returns false.

Answer 1

Treat it like JavaScript.

var userId = arg.userId;
var gameMode = arg.gameMode;
if (userId && gameMode) {
   var myCreateLobbyParameter = new CreateLobbyParameter {
      userId = userId,
      gameMode = gameMode
   }
}

Then you have a real CreateLobbyParameter object to work with, or you can do whatever with a non-conforming argument.

Answer 2

I actually found another way:

export function isSimilar(object: any, target: any): boolean {
    if (typeof(object) !== object && (typeof(object) !== typeof(target))) {
        return true;
    }
    const keys: string[] = Object.keys(object);
    const targetKeys: string[] = Object.keys(target);
    return !keys.every(x => targetKeys.indexOf(x) >= 0);
}

Usage:

hasNull(args, new CreateLobbyParameter());