In-depth understanding of Golang array deletion operation

Detailed explanation of Golang array deletion operation

In Golang programming, an array is a fixed-length data structure. Its size is determined when it is created and cannot be changed. . Therefore, when we need to delete array elements, we usually take some special operations to simulate the effect of deletion, such as creating a new array and copying the elements that need to be retained into the new array.

The following will introduce in detail several common methods of array deletion operations in Golang, and attach corresponding code examples.

Method 1: Use slicing to implement deletion operations

In Golang, slicing is a dynamic length data structure that can easily add or delete elements. Therefore, the deletion effect of the array can be achieved by converting the array into a slice and then performing the deletion operation.

package main

import "fmt"

func main() {
    arr := []int{1, 2, 3, 4, 5}
    index := 2
    arr = append(arr[:index], arr[index+1:]...)
    fmt.Println(arr)
}

In the above code, we first convert the array arr into a slice, and specify the position index of the element to be deleted as 2. Then use the append function to re-splice the elements before and after index into a new slice to achieve the deletion operation.

Method 2: Use loop traversal to implement deletion operation

Another method is to loop through the array and copy the elements that do not need to be deleted to a new array to achieve the deletion operation.

package main

import "fmt"

func main() {
    arr := []int{1, 2, 3, 4, 5}
    index := 2
    var newArr []int

    for i, v := range arr {
        if i != index {
            newArr = append(newArr, v)
        }
    }

    fmt.Println(newArr)
}

In this code, we define a new array newArr, traverse the original array arr, if the index of the current element is not equal to the index that needs to be deleted index, then copy the element to the new array. The final newArr is the deleted array.

Method 3: Use the copy function to implement the deletion operation

The last method is to use the copy function in Golang, which can copy the elements in the original array to In the target array, the deletion operation can be implemented by setting the start and end positions.

package main

import "fmt"

func main() {
    arr := []int{1, 2, 3, 4, 5}
    index := 2

    newArr := make([]int, len(arr)-1)
    copy(newArr[:index], arr[:index])
    copy(newArr[index:], arr[index+1:])

    fmt.Println(newArr)
}

In the above code, we first create a new array newArr, whose length is 1 less than the original array. Then use the copy function to copy other elements in the original array except the elements that need to be deleted to the new array to achieve the deletion operation.

Through the above three methods, we can delete arrays in Golang. In practical applications, we can choose different methods according to the situation to achieve more efficient array deletion operations.

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