Creating Computed Properties with Vue's Composition API

To create a computed property with the Vue's Composition API, you should call Vue's computed() function. For example, the following code demonstrates how to create a computed property that transforms a string value to lowercase.

Vue.createApp({
  setup() {
    const name = Vue.ref('World');
    const lowercase = Vue.computed(() => name.value.toLowerCase());

    // Make sure to return your computed property
    // so your templates can use it!
    return { name, lowercase };
  },
  template: `
  <div>
    <input v-model="name">
    <div>
      Hello, {{lowercase}}
    </div>
  </div>
  `
}).mount('#app');

Below is a live example. Notice that Vue automatically updates the value of lowercase whenever name changes.

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