How to delete array elements in uniapp (4 methods)

When developing uniapp, you often need to operate arrays, including adding, deleting, modifying and other operations. Among them, deleting elements from an array is one of the more common operations. This article will introduce how to delete array elements in uniapp.

1. splice method

splice is a method in JavaScript and one of the methods for operating arrays in uniapp. The splice method can remove elements at a specified position from an array and add new elements at the same time. The specific syntax is as follows:

array.splice(start, deleteCount, item1, item2, ...)

Among them, the start parameter indicates the starting position of the element to be deleted, the deleteCount parameter indicates the number of elements to be deleted, and parameters such as item1 and item2 indicate new elements to be added to the array.

To use the splice method in uniapp, you only need to call the splice method of the array. For example:

let arr = [1, 2, 3, 4, 5];
arr.splice(2, 1); //删除第3个元素，即3
console.log(arr); //[1, 2, 4, 5]

2. Filter method

filter is another method in JavaScript that can be used to filter elements in an array. You can also delete elements from the array through the filter method. The specific syntax is as follows:

array.filter(function(item, index, array){
    //如果返回true，则表示该元素会被保留，如果返回false，则表示该元素会被过滤
}, this)

Among them, the item parameter represents the value of the current element in the array, the index parameter represents the subscript of the current element, the array parameter represents the current array, and the this parameter represents optional, the value assigned to this .

If you want to use the filter method to delete array elements in uniapp, you only need to return false in the filter method to delete the corresponding elements. For example:

let arr = [1, 2, 3, 4, 5];
arr = arr.filter(function(item, index){
    return index !== 2; //过滤掉下标为2的元素，即3
});
console.log(arr); //[1, 2, 4, 5]

3. Pop method

pop is a method used in JavaScript to delete elements at the end of an array, and can also be used in uniapp. The pop method returns the deleted element. For example:

let arr = [1, 2, 3, 4, 5];
let last = arr.pop(); //删除最后一个元素，即5
console.log(arr); //[1, 2, 3, 4]
console.log(last); //5

4. Shift method

shift is a method used in JavaScript to delete the first element of an array, and can also be used in uniapp. The shift method returns the deleted element. For example:

let arr = [1, 2, 3, 4, 5];
let first = arr.shift(); //删除第一个元素，即1
console.log(arr); //[2, 3, 4, 5]
console.log(first); //1

Summary

The above are several common methods to delete array elements in uniapp. Among them, the splice method can delete elements at any position and supports adding new elements at the same time. The filter method can filter the elements in the array and delete the corresponding elements by returning false. The pop method deletes the last element, and the shift method deletes the first element. In practical applications, the corresponding method can be selected according to the specific situation.

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