How to delete array in golang slice

In the Golang programming language, a slice is a data structure that points to the underlying array. In some cases, you may need to remove elements from a slice. Because the slice is a reference type component, we can use the built-in functions of the Go language and the secondary encapsulation method of Golang ReSli to delete elements in the slice.

1. Use append and slice index to delete elements

We can use the append function to connect a new slice to the original slice, and also delete elements through the slice index. In this process, you can merge the parts that need to be deleted with the parts that don't need to be deleted into a new slice and assign it to the original slice variable. This is a common approach, but it can result in less efficient memory usage.

The following is an example that demonstrates how to use the append function and slice index to delete elements:

package main

import "fmt"

func main() {
    //定义一个原始切片
    s := []int{1,2,3,4,5}
    //指定需要删除的下标（索引）位置
    index := 2
    //删除操作
    s = append(s[:index], s[index+1:]...)
    fmt.Println(s)
}

In the above code, we define a primitive slice s, which contains five elements. We use the index variable to specify the subscript position that needs to be deleted, and use the append function to delete the specified element. Finally output the new slice.

2. Use slicing to traverse and delete elements

Using slicing has great advantages for more complex slicing operations. It allows us to add, delete, replace, and move elements as needed while still keeping the application's memory usage efficient. Here is an example that demonstrates how to use range to traverse a slice and delete elements using the slice index:

package main

import "fmt"

func main() {
    //定义一个原始切片
    s := []int{1,2,3,4,5}
    //遍历切片
    for i, v := range s {
        if v == 3 {
            s = append(s[:i], s[i+1:]...)
            break
        }
    }
    fmt.Println(s)
}

In the above code, we use the range function to traverse the slice. In each loop, we check if the current value is equal to 3. If it's equal to 3, we remove it using the slice index.

3. Use Golang ReSli to delete elements

Golang ReSli is a powerful packaging library that provides some useful functions to extend standard Golang slicing. In this library, the ReSliDelSlice function for slice deletion is provided. The following is an example that demonstrates how to use ReSli to delete slice elements:

package main

import (
    "fmt"
    "github.com/fvbock/golang-essentials/essentials"
)

func main() {
    //定义一个原始切片
    s := []int{1,2,3,4,5}
    //删除操作
    essentials.ReSliDelSlice(&s, 2)
    fmt.Println(s)
}

In the above code, we use the ReSliDelSlice function provided in Golang ReSli to delete elements in the slice. In this function, the first parameter &s is a pointer to the original slice, and the index specifying the item to be deleted is the second parameter, which is 2 in this example.

Summary

In this article, we introduced three different methods to delete elements in a slice. Regardless of which method you use, you should always pay attention to memory efficiency and code readability when operating on slices. Therefore, when removing elements, we should weigh the pros and cons of different paths and choose the method that best suits the current program.

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