Calling function sequentially in vuejs

I am having some problem in vuejs in executing a function/method sequentially. I have three functions like:

MethodA: function(){
    if(x = 1){
        value1 = 2;
    }

    if (x ==2){
         value2 = 4;
    }

    this.MethodB();
}

MethodB: function(){
    Total value = value1 + value2;
}

MethodC: function (){
    this.$http.get('api/getvalue').then(function(response){
        this.set('somedata', response.data);

        response.data.forEach(para){
            if(para.id == 1){
                this.MethodA();
            }
            if(para.id == 2){
                this.MethodB();
            }
        }
    });
}

ready: function(){
    this.MethodC();
}

I would like to execute this.MethodB() only after MethodA and MethodB has completely executed. How can I do this?

via Chebli Mohamed