How to remove one element from an array in Vuex?

Question

Vue.js

There is an array

state.test.questions

in Vux.
I need to remove any 1 element from this array.
I write...

removeQuestion(state,index) {
        let questions = state.test.questions
        questions.splice(index, 1)
        state.test = {
            ...state.test,
            questions:questions,
        };
    }

As I understand it
let questions = state.test.questions
assigns questions a link to the repository. And in storage there is an element which I want to delete.
How to do it differently?