Typescript pass function as parameter

Joachim 
  connectWebSocket() {
    const socket = new SockJS('http://localhost:8080/websocket');
    this.stompClient = Stomp.over(socket);

    const _this = this;
    this.stompClient.connect({ "Authorization" : "Bearer "+localStorage.getItem("Authorization")}, function (frame) {
      _this.stompClient.subscribe('/user/queue/notification',function (message) {
        const body = JSON.parse(message.body);
          console.log(body)
      });
    });
  }

This is how I currently connect to the websocket, but I want to achieve something like this

  connectWebSocket(func:Function) {
    const socket = new SockJS('http://localhost:8080/websocket');
    this.stompClient = Stomp.over(socket);

    const _this = this;
    this.stompClient.connect({ "Authorization" : "Bearer "+localStorage.getItem("Authorization")}, function (frame) {
      _this.stompClient.subscribe('/user/queue/notification',func());
    });
  }

and then call it like this

  notificationWS(hello){
    const body = JSON.parse(hello.body);
    if(body.notificationType==="FOLLOW"){
      console.log(body)
    }
  }

this.apiService.connectWebSocket(this.notificationWS.bind(this));

So i want to pass function as parameter to ws function but message is empty

A_A

The problem is, _this.stompClient.subscribe('/user/queue/notification',func());it takes a function as the second parameter. Instead, you have called the function func()and passed the return value.

Try this ( funcinstead func()):

  connectWebSocket(func:Function) {
    const socket = new SockJS('http://localhost:8080/websocket');
    this.stompClient = Stomp.over(socket);

    const _this = this;
    this.stompClient.connect({ "Authorization" : "Bearer "+localStorage.getItem("Authorization")}, function (frame) {
      _this.stompClient.subscribe('/user/queue/notification',func);
    });
  }

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