Vue Computed Properties Explained

In Vue.js, computed properties are properties that can dynamically compute a new value based on the values of other properties. They can take the values of other properties as dependencies, and will only recalculate when those dependent properties change.

In Vue components, computed properties can be used by defining them in the computed object. For example:

new Vue({
  el: '#app',
  data: {
    num1: 5,
    num2: 10
  },
  computed: {
    sum: function() {
      return this.num1 + this.num2;
    }
  }
});

In the example above, ‘sum’ is a computed property that returns the sum of ‘num1’ and ‘num2’. The value of ‘sum’ will automatically update whenever the values of ‘num1’ or ‘num2’ change.

Using computed properties can simplify the calculation logic in templates, improving code readability and maintainability. Computed properties can also cache the calculation results to avoid unnecessary redundant calculations.