Can you explain the meaning behind this syntax?

Currently, I am utilizing Vuetify and I am in the process of getting the server-side controlled data tables up and running. While browsing through the documentation, I stumbled upon this code snippet here.

However, I am facing some challenges in understanding how this code works. I am particularly perplexed by this specific piece of code.

An object without keys is being overridden by this.options, but in reality, this.options is actually empty as mentioned in the documentation.

data () {
      return {
        totalDesserts: 0,
        desserts: [],
        loading: true,
        options: {}, //<--------------------- HERE
        headers: [
          {
            text: 'Dessert (100g serving)',
            align: 'start',
            sortable: false,
            value: 'name',
          },
          { text: 'Calories', value: 'calories' },
          { text: 'Fat (g)', value: 'fat' },
          { text: 'Carbs (g)', value: 'carbs' },
          { text: 'Protein (g)', value: 'protein' },
          { text: 'Iron (%)', value: 'iron' },
        ],
      }
    },

const { sortBy, sortDesc, page, itemsPerPage } = this.options
javascriptvue.jsvue-componentvuetify.jsv-data-table

Answer №1

Object destructuring allows you to simplify code like this:

const { sortBy, sortDesc, page, itemsPerPage } = this.options

It essentially does the same thing as manually assigning each property like this:

const sortBy = this.options.sortBy;
const sortDesc = this.options.sortDesc;
// etc.

If you're wondering where the values for this.options come from, they are set using the template's .sync modifier:

<v-data-table
    ...
    :options.sync="options"
    ...
  ></v-data-table>

When options are updated, the v-data-table emits an event with the option data, which is then bound to this.options using the .sync modifier.

For a shorter demonstration of this concept, you can check out this demo (be sure to check the console).

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