How to return the opposite bool type with a short entry?

Question

Vue.js

How to make it so that the opposite type status is returned each time was true entered the function and became false saved then again entered the function was false became true

datas:{
                   TodayStatus:false,
                    TodayStatusfunc:function(){
                        console.log(!!this.datas.TodayStatus)
                        return !!this.this.datas.TodayStatus
                    }
                },
ошибка в том что он мне возвращает null постоянно

Answer 1

this.datas.TodayStatus = !this.datas.TodayStatus

Answer 2

The construction hurts the eye: this.this after return.