Adjusting a data point as v-model is updated

I'm working on a text input that is using the v-model to bind its value to data. I also need to trigger my parse() function whenever the value of this v-model changes, so that I can update an array within the data object.

<div id="app">
    <input
        id="user-input"
        type="text"
        v-model="userInput">

   <ul id="parsed-list">
      <li v-for="item in parsedInput">
          {{ item }}
      </li>
    </ul>
</div>

new Vue({
  el: '#app',
  data: {
    userInput: '',
    parsedInput: []
  }
})

let parse = input => {
    return input.split(',')
}

What is the best approach to update data.parsedInput with the parse() function whenever the v-model value changes? I'm looking for the proper Vue method to achieve this.

Answer â„–1

One effective way to handle a data property in Vue that relies on another is by utilizing a computed property. This ensures that parsedInput is automatically updated whenever userInput undergoes a change:

let parse = input => {
  return input.split(',')
}

new Vue({
  el: '#app',
  data: {
    userInput: '',
  },
  computed: {
    parsedInput() {
        return parse(this.userInput)
    }
  }
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.1/vue.js"></script>
<body>
  <div id="app">
    <input id="user-input" type="text" v-model="userInput">

    <ul id="parsed-list">
      <li v-for="item in parsedInput">
        {{ item }}
      </li>
    </ul>
  </div>
</body>

It is advisable to declare the parse function before usage to avoid is not defined errors.

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