var initialstate = 0;

​

var reducer = function(state,action){

    switch(action.type){

        case 'INCREMENT': return state + action.by;         

        default: return state;

    }

};

​

var store = Redux.createStore(reducer,initialstate);

​

var actionCreators = {

    increment: function(int){

        return {type: 'INCREMENT', by: int};

    }

};

​

var updateUI = function(state,arg2){

    console.log("Render",state,arg2,store.getState());

    var element = document.getElementById("num");

    element.innerHTML = state;

};

​

var button = document.getElementById("incbtn");

button.addEventListener("click",function(){

    var input = document.getElementById("amount"),

        increase = parseInt(input.value),

        action = actionCreators.increment(increase);

    store.dispatch(action);

});

​

store.subscribe(function(){

  updateUI(store.getState());

});

updateUI(store.getState());