How can Vue JS be used to assign numbers to specific elements in an array that meet certain conditions?

Question

How can Vue JS be used to assign numbers to specific elements in an array that meet certain conditions?

Imagine having an array of objects within your Vue state like the following:

[
 {name: "Daniel", default: false},
 {name: "Ross", default: true},
 {name: "Rachel", default: false},
 {name: "Joey", default: false}
 {name: "Monica", default: true}
 {name: "Gunther", default: true}
]

All these names are already displayed in a list on your webpage. Now, what you want to achieve is as follows:

Daniel
Ross - Default 1
Rachel
Joey
Monica - Default 2
Gunther - Default 3

It's clear from the example above that this is the desired outcome. What is the most straightforward way to accomplish this in Vue?

javascript vue.js

Answer 1

Answer №1

Consider utilizing the computed property in your code. Review the snippet below for implementation:

const app = new Vue({
  el: '#app',
  data() {
    return {
      list: [
       {name: "Sarah", default: false},
       {name: "Tom", default: true},
       {name: "Alice", default: false},
       {name: "Bob", default: false},
       {name: "Emily", default: true},
       {name: "Charlie", default: true},
      ]
    };
  },
  computed: {
    getList() {
      let index = 1;
      return this.list.map(item => {
        return item.default ? `${item.name} - Default ${index++}` : `${item.name}`;
      });
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<template>
 <ul>
  <li v-for="(item, index) in getList" :key="index">
  {{item}}
  </li>
 </ul>
</template>
</div>

Answer 2

Consider utilizing the computed property in your code. Review the snippet below for implementation:

const app = new Vue({
  el: '#app',
  data() {
    return {
      list: [
       {name: "Sarah", default: false},
       {name: "Tom", default: true},
       {name: "Alice", default: false},
       {name: "Bob", default: false},
       {name: "Emily", default: true},
       {name: "Charlie", default: true},
      ]
    };
  },
  computed: {
    getList() {
      let index = 1;
      return this.list.map(item => {
        return item.default ? `${item.name} - Default ${index++}` : `${item.name}`;
      });
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<template>
 <ul>
  <li v-for="(item, index) in getList" :key="index">
  {{item}}
  </li>
 </ul>
</template>
</div>

Answer 3

Answer №2

To achieve your desired output, Array.map can be utilized to iterate through all elements of an array

const items = [
  { label: "Apple", inStock: true },
  { label: "Banana", inStock: false },
  { label: "Orange", inStock: true },
  { label: "Pear", inStock: false }
];

let stockCount = 0;
const result = items.map(fruit => `${fruit.label}${fruit.inStock ? ` available ${++stockCount}` : ' out of stock'}`)

console.log(result)

Answer 4

To achieve your desired output, Array.map can be utilized to iterate through all elements of an array

const items = [
  { label: "Apple", inStock: true },
  { label: "Banana", inStock: false },
  { label: "Orange", inStock: true },
  { label: "Pear", inStock: false }
];

let stockCount = 0;
const result = items.map(fruit => `${fruit.label}${fruit.inStock ? ` available ${++stockCount}` : ' out of stock'}`)

console.log(result)

Answer 5

Answer №3

Give this a shot:

let defaultCounter = 0;
const info = [
  { name: "Daniel", defaultValue: false },
  { name: "Ross", defaultValue: true },
  { name: "Rachel", defaultValue: false },
  { name: "Joey", defaultValue: false },
  { name: "Monica", defaultValue: true },
  { name: "Gunther", defaultValue: true },
].map((element) => {
  if (element.defaultValue) {
    defaultCounter++;
    return {
      ...element,
      defCount: defaultCounter,
    };
  } else {
    return {
      ...element,
      defCount: null,
    };
  }
});

console.log(info);

<li v-for="(item) in array" :key="item.name">
{{`${item.name}${item.defCount? ` - Default ${item.defCount}`:''}`}}
</li>

Answer 6

Give this a shot:

let defaultCounter = 0;
const info = [
  { name: "Daniel", defaultValue: false },
  { name: "Ross", defaultValue: true },
  { name: "Rachel", defaultValue: false },
  { name: "Joey", defaultValue: false },
  { name: "Monica", defaultValue: true },
  { name: "Gunther", defaultValue: true },
].map((element) => {
  if (element.defaultValue) {
    defaultCounter++;
    return {
      ...element,
      defCount: defaultCounter,
    };
  } else {
    return {
      ...element,
      defCount: null,
    };
  }
});

console.log(info);

<li v-for="(item) in array" :key="item.name">
{{`${item.name}${item.defCount? ` - Default ${item.defCount}`:''}`}}
</li>

How can Vue JS be used to assign numbers to specific elements in an array that meet certain conditions?

Answer №1

Answer №2

Answer №3

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