[Vuejs]-Is the Vuex mutation written correctly?

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flights is your main array that holds the flights objects. It would be much easier to just use a getter (or a couple of getters) to get your filtered data, without having to mutate the state.

getters: {
  getFlightsByTripClass: (state) => (tripClass) => {
    return state.flights.filter(flight => flight.trip_class === tripClass);
  }
}

To use this getter in your Vue component, you can access it using this.$store.getters:

computed: {
  filteredFlights() {
    return this.$store.getters.getFlightsByTripClass(1);
  }
}

Also, for good measure, make sure to follow the camel case convention for your variables. Use numberOfChange, instead of number_of_change.

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