Vue .js Force computed properties to recompute?

Computed properties in Vue.js are a powerful feature, primarily used for dynamically calculating a value based on other data properties. Computed properties are cached based on their dependencies and only recalculate when the relevant dependencies change.

No Forced Recalculation

Vue.js does not force computed properties to recalculate. The recalculation of computed properties is automatically determined based on their reactive dependencies. If the reactive data dependencies do not change, the computed properties will not recalculate.

Example: Automatic Update of Computed Properties

Consider the following Vue component example:

vue
<template>
  <div>
    <p>Original price: {{ price }}</p>
    <p>Discounted price: {{ discountedPrice }}</p>
    <button @click="discount += 5">Increase discount</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      price: 100,
      discount: 10
    };
  },
  computed: {
    discountedPrice() {
      return this.price * (1 - this.discount / 100);
    }
  }
}
</script>

In this example, discountedPrice is a computed property that depends on price and discount. When you click the button to increase the discount, the value of discount changes, causing discountedPrice to recalculate. If the values of price and discount do not change, discountedPrice will not recalculate.

Summary

Overall, Vue.js automatically manages the recalculation of computed properties using dependency tracking, without manual intervention. This design makes data management more concise and efficient, reducing unnecessary calculations and resource waste. In practical development, this allows developers to focus on business logic without worrying about when data should be recalculated.