Vue 'computed' Option

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Example

Using a computed property inside the computed option to show the appropriate button text.

export default {
  data() {
    return {
      msg: 'Hello World!',
      showMsg: false
    };
  },
  computed: {
    btnText() {
      if( this.showMsg ) {
        return 'Hide'
      }
      else {
        return 'Show'
      }
    }
  }
};
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Definition and Usage

The computed option is an object with all the computed properties that are declared on the Vue instance.

Computed properties are usually read-only (see the example above), but it is possible to define a computed property as an object with both a get and a set function, which means that the computed property can also be written to.

Note: Arrow functions should be avoided when declaring computed properties because the Vue instance cannot be reached from inside such a function using the this keyword.

Related Pages

Vue Tutorial: Vue Computed Properties

Vue Tutorial: Vue v-on Directive


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