Explore how to delete bytes in Golang

In Golang, byte type data represents an 8-bit byte. In many cases, we need to delete some unnecessary bytes. In this article, we will explore how to delete byte in Golang.

Method 1: Use the copy function

In Golang, we can use the copy function to achieve byte deletion. The definition of the copy function is as follows:

func copy(dst, src []Type) int

Among them, dst is the target byte array, src is the source byte array, and Type represents the data type. The copy function returns the number of elements copied.

Suppose we need to delete elements from index i to index j in a byte array of length n. At this time, we can use the copy function to copy the elements of j 1 ~ n to the position of i ~ n-j i to achieve byte deletion. The specific code is as follows:

func deleteByte(s []byte, i, j int) []byte {
    copy(s[i:], s[j+1:])
    return s[:len(s)-(j-i+1)]
}

Among them, i and j represent the starting position and ending position of the byte that needs to be deleted, respectively. The deleteByte function accepts a byte array s as a parameter and returns a new array with the specified byte deleted.

We can test the effect of the deleteByte function through the following code:

func main() {
    s := []byte{'a', 'b', 'c', 'd', 'e', 'f'}
    s = deleteByte(s, 1, 3)
    fmt.Println(s) // 输出 [a e f]
}

Method 2: Use the append function

In addition to using the copy function, we can also use the append function to achieve this byte deleted. The specific method is to use the append function to store the bytes before and after the byte that needs to be deleted into a new array to achieve the deletion effect. The specific code is as follows:

func deleteByte2(s []byte, i, j int) []byte {
    if i >= len(s) || j >= len(s) || i > j {
        return s
    }
    before := s[:i]
    after := s[j+1:]
    return append(before, after...)
}

Among them, i and j represent the starting position and ending position of the byte that needs to be deleted, respectively. The deleteByte2 function accepts a byte array s as a parameter and returns a new array with the specified byte deleted.

We can test the effect of deleteByte2 function through the following code:

func main() {
    s := []byte{'a', 'b', 'c', 'd', 'e', 'f'}
    s = deleteByte2(s, 1, 3)
    fmt.Println(s) // 输出 [a e f]
}

Both methods can achieve byte deletion, which method to use depends on the specific situation and personal preference. I hope this article can be helpful to Golang developers.

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