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@@ -0,0 +1,69 @@
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+function shoppingCartReducer(state, {type, what, howMach, money}) {
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+ if(!state) {
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+ return {
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+ videoCards: {
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+ amount: 100,
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+ price: 180
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+ },
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+ processors: {
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+ amount: 100,
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+ price: 120
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+ },
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+ memory: {
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+ amount: 100,
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+ price: 80
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+ },
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+ totalMoney: 0
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+ }
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+ }
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+ if(type === 'buy') {
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+ return {
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+ ...state,
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+ [what]: {
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+ amount: (state[what].amount - howMach < 0 || money < state[what].price) ? state[what].amount : state[what].amount - howMach,
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+ price: state[what].price
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+ },
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+ totalMoney: (state[what].amount - howMach < 0 || money < state[what].price) ? state.totalMoney : (howMach * money) + state.totalMoney
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+ }
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+ }
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+ return state;
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+}
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+
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+function createStore(reducer){
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+ let state = reducer(undefined, {});
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+ let cbs = [];
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+
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+ const getState = () => state;
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+ const subscribe = cb => (cbs.push(cb),
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+ () => cbs = cbs.filter(c => c !== cb));
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+
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+ const dispatch = action => {
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+ const newState = reducer(state, action);
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+ if (newState !== state){
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+ state = newState;
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+ for (let cb of cbs) cb();
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+ }
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+ }
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+
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+ return {
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+ getState,
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+ dispatch,
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+ subscribe
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+ }
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+}
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+
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+const store = createStore(shoppingCartReducer);
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+
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+store.subscribe(() => storeBlock.innerText = JSON.stringify(store.getState()));
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+
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+const buyAction = (what, howMach, money) => ({type: 'buy', what: `${what}`, howMach, money});
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+
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+store.dispatch(buyAction('videoCards', 0, 0));
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+
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+buy.addEventListener('click', () => {
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+ let what = goods[goods.options.selectedIndex].value;
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+ let howMach = amount.value;
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+ let moneyVal = money.value;
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+ store.dispatch(buyAction(what, howMach, moneyVal));
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+})
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+
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