How to remove elements from an array in golang (3 methods)

In Golang, array is a very commonly used data type. In some scenarios, we need to remove an element from the array, which requires the use of some techniques. This article will introduce several methods to remove elements from Golang arrays.

Method 1: Use the append function

The append function is a very commonly used function in Golang and can be used to add elements to a slice. You can use this function to remove an element at a specified position in an array. We can save the elements in the slice of the array in a new slice, and then remove the unnecessary element.

The following code demonstrates how to use the append function to remove elements at specified positions in the array:

func removeElement(slice []string, index int) []string {
    return append(slice[:index], slice[index+1:]...)
}

func main() {
    array := []string{"apple", "banana", "cherry", "date", "elderberry"}
    index := 2
    array = removeElement(array, index)

    fmt.Println(array)
}

Output results:

[apple banana date elderberry]

The advantage of this method is that it can be copied While removing the original array, unnecessary elements are removed, and deletion of any length is also allowed. But its disadvantage is that it requires data copying, and when the array is very large, the efficiency will be slightly lower.

Method 2: Use the exchange method

The second method is to use a loop to operate and put the element to be deleted at the end of the array. This method is rarely used, but is very simple and convenient in some situations.

The following code demonstrates how to use the exchange method to remove elements at specified positions in the array:

func removeElement(array []string, index int) []string {
    array[index], array[len(array)-1] = array[len(array)-1], array[index]
    return array[:len(array)-1]
}

func main() {
    array := []string{"apple", "banana", "cherry", "date", "elderberry"}
    index := 2
    array = removeElement(array, index)

    fmt.Println(array)
}

Output results:

[apple banana elderberry date]

The advantage of this method is that no data is required To copy, you only need to exchange array elements. But its disadvantage is that if the element we need to delete is at the beginning of the array, then every time we exchange, we need to move all the following elements forward, which will be very inefficient.

Method 3: Use slicing

The third method is to use slicing to directly cut off unnecessary elements. It is similar to the first method, but it uses slices to operate directly instead of creating a new slice like append.

The following code demonstrates how to use slicing to remove elements at specified positions in an array:

func removeElement(array []string, index int) []string {
    return append(array[:index], array[index+1:]...)
}

func main() {
    array := []string{"apple", "banana", "cherry", "date", "elderberry"}
    index := 2
    array = removeElement(array, index)

    fmt.Println(array)
}

Output results:

[apple banana date elderberry]

The advantage of this method is that it is very convenient, and It's very similar to the first method. But its disadvantage is that it requires data copying, and when the array is very large, the efficiency will be slightly lower.

Summary:

In Golang, there are many ways to remove elements from an array. Three common methods include using the append function, swapping elements, and using slicing. Different methods are suitable for different application scenarios. The appropriate method needs to be selected based on the specific situation.

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