Share the array deletion method in Golang

Golang array deletion skills sharing

In daily development, we often encounter situations where we need to delete arrays. For a strongly typed language like Golang, deleting array elements may not be as straightforward as in other languages. This article will share some techniques for deleting arrays in Golang and provide specific code examples.

Characteristics of Slice

In Golang, arrays can be manipulated through slices. A slice is a reference type that points to a portion of the underlying array, so operations on the slice directly affect the original array. Slices are of variable length compared to arrays, which makes deleting arrays more flexible.

Delete elements at specified positions

To delete specific elements in a slice, you can use the cutting function of the slice. Suppose there is an integer slice arr, and we want to delete the element with index index. This can be achieved in the following way:

arr = append(arr[:index], arr[index+1:]...)

In the above code, append The function will merge arr[:index] and arr[index 1:] into a new slice, thereby deleting the element at the specified position. The following is a complete example:

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) // 输出 [1 2 4 5]
}

Delete elements with a specific value

Sometimes we need to delete elements with a specific value in a slice. This can be done by traversing the slice and using append function to implement. The following is an example:

package main

import "fmt"

func deleteElement(arr []int, value int) []int {
    var res []int
    for _, v := range arr {
        if v != value {
            res = append(res, v)
        }
    }
    return res
}

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

Summary

By using slices and the append function, we can more easily implement deletion of arrays in Golang. When operating arrays, you need to pay attention to the characteristics of slicing and its impact on the underlying array. I hope the tips and code examples provided in this article will be helpful to everyone, and you can handle array deletion operations more flexibly in actual development.

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