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custom.js
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custom.js
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const counter = document.getElementById("counter");
const increment = document.getElementById("increment");
const decrement = document.getElementById("decrement");
// Action Creators
const INCREMENT = "INCREMENT";
const DECREMENT = "DECREMENT";
const initialState = {
value: 0,
};
const increments = (value) => {
return {
type: INCREMENT,
payload: value,
};
};
const decrements = (value) => {
return {
type: DECREMENT,
payload: value,
};
};
// Reducer Function
function reducerFunction(state = initialState, action) {
if (action.type === INCREMENT) {
return {
...state,
value: state.value + action.payload,
};
} else if (action.type === DECREMENT) {
return {
...state,
value: state.value - action.payload,
};
}
return state;
}
// Store
const store = Redux.createStore(reducerFunction);
store.subscribe(renderUi);
function renderUi() {
const state = store.getState();
counter.innerText = state.value;
}
// Event Listeners
increment.addEventListener("click", () => {
store.dispatch(increments(5));
});
decrement.addEventListener("click", () => {
store.dispatch(decrements(2));
});