Vue Js Reverse list in v-for loop: In Vue.js, the v-for directive is used to loop through an array and render its elements. By default, the v-for directive renders the array in the order in which it is defined. However, in some cases, you may want to display the elements in reverse order.

To achieve this, you can use the reverse() method of the array before passing it to the v-for directive. The reverse() method reverses the order of the elements in the array, which means that the last element becomes the first, and vice versa.

How you can use the reverse() method to reverse the order of an array in a v-for loop?

Here is an explanation of the code Vue Js Reverse list in v-for loop:

1. A Vue.js directive v-for is used to render a list of items.
2. The reversedItems computed property is defined, which returns a reversed copy of the items array using the slice() and reverse() methods.
3. The key binding is used to assign a unique identifier to each item in the list, which helps Vue.js efficiently update the DOM when the list changes.
4. For each item in the reversedItems array, a new <li> element is created with the language property of the item interpolated inside the element.
5. The resulting list of <li> elements is rendered to the DOM as part of the Vue.js component.

Overall, this code creates a list of items rendered in reverse order, with each item’s language property displayed in an HTML <li> element.

Vue Js Reverse list in v-for loop Example

<div id="app">
     <ul>
		<li v-for="item in reversedItems" :key="item.id">
			{{ item.language }}
		</li>
	 </ul>
</div>
	<script type="module">
		const app = Vue.createApp({
			data() {
				return {
					items: [
						{ id: 1, language: 'Vue Js' },
						{ id: 2, language: 'React' },
						{ id: 3, language: 'Angular' },
						{ id: 4, language: 'Javascript' },
					],
				};
			},
			computed: {
				reversedItems() {
					return this.items.slice().reverse();
				},
			},
		});
		app.mount('#app');
</script>

In the above code, it is crucial to use the slice() method before applying the reverse() method to the items array. The reason for this is that reverse() modifies the original array in place, meaning that the order of its elements is permanently changed. If slice() is not used to create a copy of the original array, any subsequent use of the items array will reflect this reversed order. Therefore, by using slice() to create a separate copy of the array, the original array is preserved, and the reversed copy can be manipulated without affecting the original data.

Output of above example