[Vuejs]-Mutate a computed property with in a method in vue

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Looks like you need to use another variable to store the value for the selected index.

// Added variable selectedYearIndex
let selectedYearIndex;
getSelectedYearIndex() {
    // Here I set the value of selectedYearIndex if it hasn't been been set yet
    if (this.selectedYearIndex === undefined) {
        this.selectedYearIndex = this.getYears.length - 1;
    }
    return this.selectedYearIndex;
}

Then you can set the value of the backing field

onSelect({ selectedIndex }) {
   this.selectedYearIndex = selectedIndex
}

The reason that your assignment didn’t do anything is because this.getSelectedYearIndex = selectedIndex is turning this.selectedYearIndex into a number instead of assigning the value to a variable.

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