eiru_purchases/src/store/modules/currency.js

const state = {
    currencies: [],
    loadingCurrencies: true,
    selectedCurrency: null
}

const getters = {
    currencies(state) {
        return state.currencies
    },
    loadingCurrencies(state) {
        return state.loadingCurrencies
    },
    currencySymbols(state) {
        if (!state.currencies || !state.selectedCurrency) {
            return []
        }

        return state.currencies.filter(c => state.selectedCurrency.id !== c.id).map(c => c.symbol)
    },
    baseCurrency(state) {
        return state.currencies.find(c => c.base === true)
    },
    selectedCurrency(state) {
        return state.selectedCurrency
    },
    selectedCurrencySymbol(state) {
        return state.selectedCurrency && state.selectedCurrency.symbol
    }
}

const mutations = {
    setCurrencies(state, payload) {
        state.currencies = [...payload]
    },
    setLoadingCurrencies(state, payload) {
        state.loadingCurrencies = !!payload
    },
    autoSelectCurrency(state) {
        state.selectedCurrency = state.currencies.find(item => item.base == true)
    }
}

const actions = {
    initCurrencies({ commit }, payload) {
        commit('setCurrencies', payload)
        commit('autoSelectCurrency')
        commit('setLoadingCurrencies', false)
    },
    resetCurrency({ commit }, payload) {
        commit('setLoadingCurrencies', true)
        commit('setCurrencies', [])
    }
}

export default {
    state,
    getters,
    mutations,
    actions
}