How to remove duplicate data from arrays in Vue (three methods)

During the development process of Vue, we often use arrays. However, in actual development, we sometimes encounter the problem of duplicate data. At this time, we need to deduplicate the array. This article will introduce you to the method of array deduplication in Vue.

1. Use the set structure to deduplicate

set is a data structure in ES6 that can remove duplicate elements. It is characterized by being disordered and non-repeating. It is often used to deduplicate arrays. Scenes.

let arr = [1, 2, 2, 3, 3, 4, 5]; let set = new Set(arr); arr = Array.from(set);

In the above code, we first define an array arr, then convert it into a set collection through the new Set() method, and save the result to the set variable. Finally, we convert the set collection into an array.

2. Use the indexOf method to remove duplicates

The indexOf method can find the first index of a given element in the array. If it is not found, it returns -1, so we can take advantage of this feature. To perform array deduplication.

let arr = [1, 2, 2, 3, 3, 4, 5]; let newArr = []; for (let i = 0; i < arr.length; i++) { if (newArr.indexOf(arr[i]) === -1) { newArr.push(arr[i]); } } arr = newArr;

In the above code, we traverse the original array arr through a for loop. During each traversal, we use the indexOf method to find the index of the current element in the new array newArr. If the index is not found, the element is added to newArr.

3. Use the includes method to remove duplicates

The includes method is a new method of ES7, which determines whether an array contains a specified value and returns true or false. We can perform deduplication operations based on this feature.

let arr = [1, 2, 2, 3, 3, 4, 5]; let newArr = []; for (let i = 0; i < arr.length; i++) { if (!newArr.includes(arr[i])) { newArr.push(arr[i]); } } arr = newArr;

In the above code, we use a for loop to traverse the original array arr. During each traversal, use the includes method to determine whether the current element is in the new array newArr. If it does not exist, add the element to in newArr.

Summary

This article introduces three common methods of array deduplication in Vue, namely using the set structure, indexOf and includes methods. Through these three methods, you can easily implement array deduplication operations, improve development efficiency, and avoid data anomalies. We can choose the appropriate method to perform deduplication operations based on the actual situation to improve our development efficiency.

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