vue.js use effect in javascript

In Vue.js, there is a built-in lifecycle hook called created. The primary purpose of this hook is to allow you to perform logic and setup tasks as soon as the component is created. The created hook is a perfect place to perform any initializations required before the component is mounted. In effect, this hook can be used to mimic the behavior of a class constructor. In order to use the created hook, simply define a method on the component called created:

index.tsx
Vue.component('my-component', {
  created: function () {
    // Initialize component here
  }
})
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In this example, we have defined a new component with a created hook. The created hook is defined as a function that will be run whenever a new instance of the component is created. Inside the function, you can perform any initializations required before the component is mounted.

One of the core concepts in Vue.js is reactivity, which means that the framework automatically updates the view when the state changes. In practice, this means that you can create reactive properties on the component, and when any of these properties change, the view will be updated automatically. To achieve this, you can use the data option on a component to define an object whose properties are reactive:

index.tsx
Vue.component('my-component', {
  data: function () {
    return {
      count: 0
    }
  },
  created: function () {
    // Initialize component here
  }
})
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In this example, we have defined a reactive property called count on the component using the data option. Because count is reactive, whenever its value changes, the view will be updated automatically.

In summary, Vue.js provides a built-in lifecycle hook created that can be used to perform initialization tasks when a component is created. Additionally, you can use the data option to create reactive properties, which will automatically update the view when changed.