Operation in Golang [Trim function of]byte type

This is a creation in Article, where the information may have evolved or changed.

A pit of strings in Golang this blog post describes the difference between a string in Golang and a string in C:the string in C is a \x0 sequence of bytes ending with, and the string in Golang is stricter, not judged by the \x0 end , but computes all the bytes in the value of the string variable.

The string in Golang is printed, because \x0 it is not a printable character, so there is no difference between the strings in C and the print. However, in some functions that require the string to be computed by byte, this can cause problems. The common practice is to iterate over the string and get only the valid bytes in the byte sequence.

We can write a function to do this, or we can use the library in the Golang standard library bytes . The bytes Library provides []byte operations on types that provide interfaces that are similar to the string interfaces provided by the type.

bytesProvides a Compare、Count、Equal、Index、Join、Split、Replace function that is directly targeted []byte to a type. There is also an important Buffer class that treats the []byte type as a buffer, providing a convenient operation for the buffer: the 读、写、和string/rune之间的转换、迭代 function.

In the bytes library, there is a Trim series of functions, its function is to []byte cut the type, remove the unwanted parts.

func Trim(s []byte, cutset string) []bytefunc TrimFunc(s []byte, f func(r rune) bool) []bytefunc TrimLeft(s []byte, cutset string) []bytefunc TrimLeftFunc(s []byte, f func(r rune) bool) []bytefunc TrimPrefix(s, prefix []byte) []bytefunc TrimRight(s []byte, cutset string) []bytefunc TrimRightFunc(s []byte, f func(r rune) bool) []bytefunc TrimSpace(s []byte) []bytefunc TrimSuffix(s, suffix []byte) []byte

We need to use the TrimRight function to remove the non-printable characters from the byte sequence \x0 , preserving only what is needed:

package mainimport (    "bytes"    "fmt")func main() {    var a [10]byte = [10]byte{1, 2, 3}    fmt.Printf("%q\n", a)    // 将数组a转换为切片    b := a[:]    // 去除切片尾部的所有0    c := bytes.TrimRight(b, "\x00")    fmt.Printf("%q\n", c)}