Exploring the functionality of a dynamic array in Vue.js 3

Question

Exploring the functionality of a dynamic array in Vue.js 3

In my Vue.js 3 (beta) project, I have created an array using the reactive function in order to bind its items to various UI components through a loop. This setup has been successful thus far.

However, I now face the challenge of updating a specific value within this array. Due to the fact that Vue.js proxies the array, attempting to use methods like find or findIndex directly on it does not yield the desired results; the proxy complicates things as it's not just a straightforward array.

To work around this issue, I decided to first get a raw copy of the array using toRaw, perform the search operation with findIndex on the copy, and then update the original array using the index obtained. While this method does achieve the desired outcome, it doesn't feel like the most elegant solution.

Can someone suggest a more efficient approach to tackling this problem?

PS: I am specifically looking for solutions that are compatible with Vue 3, so any advice pertaining to Vue 2.x is not necessary in this case.

javascript arrays vue.js vuejs3

Answer 1

Answer №1

All of the array's functions remain accessible via the Proxy, allowing you to utilize methods like find and findIndex:

import { reactive } from 'vue'

const items = reactive([1,2,3])

console.log(items.find(x => x % 2 === 0))
console.log(items.findIndex(x => x % 2 === 0))

const MyApp = {
  setup() {
    const items = Vue.reactive([1,2,3])
    
    return {
      items,
      addItem() {
        items.push(items.length + 1)
      },
      logFirstEvenValue() {
        console.log(items.find(x => x % 2 === 0))
      },
      logFirstEvenIndex() {
        console.log(items.findIndex(x => x % 2 === 0))
      },
      incrementItems() {
        for (let i = 0; i < items.length; i++) {
          items[i]++
        }
      }
    }
  }
}

Vue.createApp(MyApp).mount('#app')

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ccbab9a98cffe2fce2fce1beafe2f9">[email protected]</a>"></script>
<div id="app">
  <button @click="logFirstEvenValue">Display first even item</button>
  <button @click="logFirstEvenIndex">Display index of first even item</button>
  <button @click="incrementItems">Increase items</button>
  <button @click="addItem">Add new item</button>
  <ul>
    <li v-for="item in items">{{item}}</li>
  </ul>
</div>

Answer 2

All of the array's functions remain accessible via the Proxy, allowing you to utilize methods like find and findIndex:

import { reactive } from 'vue'

const items = reactive([1,2,3])

console.log(items.find(x => x % 2 === 0))
console.log(items.findIndex(x => x % 2 === 0))

const MyApp = {
  setup() {
    const items = Vue.reactive([1,2,3])
    
    return {
      items,
      addItem() {
        items.push(items.length + 1)
      },
      logFirstEvenValue() {
        console.log(items.find(x => x % 2 === 0))
      },
      logFirstEvenIndex() {
        console.log(items.findIndex(x => x % 2 === 0))
      },
      incrementItems() {
        for (let i = 0; i < items.length; i++) {
          items[i]++
        }
      }
    }
  }
}

Vue.createApp(MyApp).mount('#app')

<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ccbab9a98cffe2fce2fce1beafe2f9">[email protected]</a>"></script>
<div id="app">
  <button @click="logFirstEvenValue">Display first even item</button>
  <button @click="logFirstEvenIndex">Display index of first even item</button>
  <button @click="incrementItems">Increase items</button>
  <button @click="addItem">Add new item</button>
  <ul>
    <li v-for="item in items">{{item}}</li>
  </ul>
</div>

Exploring the functionality of a dynamic array in Vue.js 3

Answer №1

Similar questions

Converting an object to an array with the help of jQuery

Utilize a JSON object with ChartJS for data visualization

Tips for incorporating nonce or sha into the connect-src directive in Content Security Policy (CSP)

Utilizing Node.js for Lambda Functions

The React SwiperJs autoplay feature seems to be malfunctioning, as the swiper is not automatically

The error message states: "Cannot create element as the React object is not

The login page allows entry of any password

JavaScrip $("").text(); is a straightforward way to recognize and extract

The recursive component is functional exclusively outside of its own scope

Adjusting the dimensions of the central container

The art of creating an asynchronous function: A comprehensive guide

Using Laravel's compact function within Vue components

Looking to display or conceal several divs according to the option selected from a dropdown menu?

Using Docker to containerize a Vue single-page application, with the flexibility to switch API URLs based on the environment

Tips for sending Json data through a form to a controller and storing it in a database

Ways to host static content in ExpressJS for specific directories and exclude others

JavaScript encountered an issue as it attempted to reference the variable "button" which was

Adjusting the color of a box in Threejs through dat.gui.min.js controls

JavaScript validation for a form dynamically generated within a table

Encountered an issue while constructing swagger in Laravel project using Vite