Introduction to the method of deleting elements in a slice using Go language

There are three methods to remove slice elements in Go language: append function (not recommended), copy function and manual modification of the underlying array. The append function can delete tail elements, the copy function can delete middle elements, and manually modify the underlying array to directly assign and delete elements.

#Introduction to the Go language method of deleting elements in a slice

In the Go language, a slice is a reference type that points to the underlying array. When you delete an element from a slice, you need to update the underlying array referenced by the slice.

Built-in functions

appendFunction (not recommended)

appendFunction can be deleted at the same time and append elements. When you need to delete the tail elements of the slice, you can use the following syntax:

slice = slice[:len(slice)-1]    // 删除最后一个元素

copyFunction

copyThe function can Copies part of a slice to another slice. When you need to delete the middle element, you can copy the part after the element to be deleted to a new slice:

index := 2
slice = append(slice[:index], slice[index+1:]...)    // 删除索引为index的元素

Manually modify the underlying array

Direct assignment

You can directly assign the underlying array of the slice to a new array, which does not contain the elements to be deleted:

index := 2
slice[index] = slice[len(slice)-1]    // 将要删除元素移动到最后
slice = slice[:len(slice)-1]         // 删除最后一个元素

Practical case

Take a slice containing integers as an example to demonstrate how to delete the slice Elements in:

package main

import "fmt"

func main() {
    slice := []int{1, 2, 3, 4, 5}
    
    // 使用append函数删除最后一个元素
    slice = slice[:len(slice)-1]
    fmt.Println(slice) // 输出：[1 2 3 4]
    
    // 使用copy函数删除中间元素
    index := 2
    slice = append(slice[:index], slice[index+1:]...)
    fmt.Println(slice) // 输出：[1 2 4 5]
    
    // 使用直接赋值删除元素
    index = 1
    slice[index] = slice[len(slice)-1]
    slice = slice[:len(slice)-1]
    fmt.Println(slice) // 输出：[1 3 4 5]
}

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