array object inside an arrar in vue

1new Vue({
2    el: '#app',
3    data:{
4        myArr : [
5            {
6                name: 'object-1',
7                nestedArr: ['apple', 'banana']
8            },
9            {
10                name: 'object-2',
11                nestedArr: ['grapes', 'orange']
12            }
13        ]
14    },
15    methods:{
16        changeArrayItem: function(){
17            this.$set(this.myArr[1].nestedArr, 1, 'strawberry');
18        }
19    }
20}) 
21