FirstViewModel.kt

package com.nsadisha.mvvmtest_2.viewModel

import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.nsadisha.mvvmtest_2.model.Counter

class FirstViewModel: ViewModel() {
    private var _data = MutableLiveData<Counter>().apply {
        value = Counter(0)
    }
    val data: LiveData<Counter> = _data

    fun increase(){
        _data.value = _data.value.apply {
            this?.increment()
        }
    }
}