VueX

Vuex is the state management pattern being used in Vue. 

Vuex is one-way-data flow. see picture below

Vuex state flow
As you see above image shows that vue component is apart from vuex. Vuex allows you to manage or handle state outside vue component. This is best practice for large-scale-SPA apps.

Installation

This is done with Npm 
            npm install vuex --save
This is done with Yarn
          yarn add vuex

Vuex requires promise. 
You may need to install promise as 
            npm install es6-promise --save
or 
           yarn add es6-promise

Example:
import Vue from 'vue';
import Vuex from 'vuex';
Vue.use(Vuex)

const store = new Vuex.Store({
state: {
count: 0
},
mutations: {
increment (state) {
state.count++
}
}
})

store.commit('increment') // result 1
store.commit('increment') // result 2
console.log(store.state.count)

Vue.use(Vuex) is very important to have this to tell vue to use vuex state management.
state: is the initial object in vuex instance.
mutations:  is to change or modify any value you prefer but not yet change value of count:0.
store.commit('increment'):  is to commit the change to count:1. 

Final result is 2 as you commit two times.






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