Summarize the common methods of deleting slice elements in Golang

In Golang, slice is a very commonly used data type. When processing data, we often encounter situations where we need to delete certain elements in a slice. This article will introduce the commonly used methods to delete slice elements in Golang.

1. Use the append function to delete slice elements

In Golang, you can use the append function to append to a slice. Using this feature, we can delete an element in the slice by moving the elements behind the element that needs to be deleted and then deleting the element at the end. The specific operation is as follows:

func deleteSlice(s []int, index int) []int {
    copy(s[index:], s[index+1:])
    return s[:len(s)-1]
}

In the above code, the copy function moves the elements behind the elements that need to be deleted forward. We implement the forwarding operation by copying the elements behind the index position of the element that needs to be deleted to the index position, and overwriting the deleted elements in turn. Finally, the length function of the slice is used to delete the copied elements at the end, thus realizing the deletion operation.

2. Use slices to recombine and delete elements

In Golang, there is a built-in method for intercepting elements from slices. We can use this method to recombine the elements in front and behind the elements that need to be deleted. Combine into a new slice. The specific code is as follows:

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

In the above code, we use the append function to recombine the elements before and after the element that needs to be deleted into a slice. s[:index] represents the first index elements of the original slice, and s[index 1:] represents the elements from index 1 to the end of the original slice. By recombining these two slices, the element can be deleted.

3. Use slice expansion to delete elements

When a slice is expanded, a section of memory will be reallocated and the value of the original slice will be copied to the new memory. We can achieve the purpose of overwriting the elements that need to be deleted by first assigning the elements behind the elements that need to be deleted forward. Then, by using the built-in append function, the first index elements of the original slice and the elements after the deleted element are re-appended to the newly allocated memory. The specific code is as follows:

func deleteSlice(s []int, index int) []int {
    s[index] = s[len(s)-1]
    return s[:len(s)-1]
}

In the above code, we re-cover the element that needs to be deleted as the last element, and then delete the last element, thus realizing the deletion operation.

4. Summary

This article introduces the commonly used methods to delete slice elements in Golang. Different methods have their own advantages and disadvantages, and the specific use needs to be determined according to the actual situation. I hope that through the introduction of this article, readers can better use slices for data processing.

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