golang slice deletion

Golang is a very popular programming language. Its powerful functions and ease of use make more and more developers choose to use it to develop applications. In Golang, slice is a very common data type whose length can be changed dynamically and can be easily manipulated. In the actual development process, slices often need to be deleted. This article will introduce you to the slice deletion method in Golang.

1. Delete elements through the append() function

The most common way to delete an element in a slice is to use the built-in append() function of the Go language. The specific operations are as follows:

1. Find the subscript of the element to be deleted

2. Move all elements behind the element to be deleted forward by one position, overwriting the element to be deleted

3 .Use the slicing operation of the slice to intercept the new slice after deleting the element.

The following is a sample code:

func deleteElement(s []int, index int) []int {
    return append(s[:index], s[index+1:]...)
}

func main() {
    s := []int{1, 2, 3, 4, 5}
    index := 3
    s = deleteElement(s, index)
    fmt.Println(s)  // 输出：[1 2 3 5]
}

In the above code, the deleteElement function accepts a slice s and the element to be deleted. Subscript index, call the append() function to obtain the new slice after deleting the element. In this way, there are no deleted elements in the original slice s.

2. Traverse the slice to delete elements

In addition to the append() function, you can also use the method of traversing the slice to perform deletion operations. The specific steps are as follows:

1. Traverse the slice, Find the subscript of the element to be deleted

2. Move all the elements behind the element to be deleted forward by one, overwriting the element to be deleted

3. Use the slicing operation of slicing, Intercept the new slice after deleting the element

The following is a sample code:

func deleteElement(s []int, elem int) []int {
    for i := 0; i < len(s); i++ {
        if s[i] == elem {
            s = append(s[:i], s[i+1:]...)
            break
        }
    }
    return s
}

func main() {
    s := []int{1, 2, 3, 4, 5}
    elem := 3
    s = deleteElement(s, elem)
    fmt.Println(s)  // 输出：[1 2 4 5]
}

In the above code, the deleteElement function accepts a slice s and the element elem to be deleted, and finds the element by traversing the slice The subscript of the deleted element, and then use the append() function to get the new slice after the deleted element.

Summary:

This article introduces two ways to delete slices in Golang, one is to use the append() function, and the other is to achieve it by traversing slices. Both have their own advantages and disadvantages, and developers can choose the appropriate deletion method based on the actual situation.

In the actual development process, you need to pay attention to the space memory problems that may arise when using slice deletion operations. Because slice deletion actually moves all elements after the element to be deleted one position forward. If the slice is very large, deleting elements will cause a waste of memory space. Therefore, it is recommended to avoid frequent slice deletion operations as much as possible to avoid affecting program performance.

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