将字节片转换为字符串时，Golang会进行任何转换吗？

Question

Does Golang do any conversion or somehow try to interpret the bytes when casting a byte slice to a string? I've just tried with a byte slice containing a null byte and it looks like it still keep the string as it is.

var test []byte
test = append(test, 'a')
test = append(test, 'b')
test = append(test, 0)
test = append(test, 'd')
fmt.Println(test[2] == 0) // OK

But how about strings with invalid unicode points or UTF-8 encoding. Could the casting fail or the data be corrupted?

Answer 1

The Go Programming Language Specification

String types

A string type represents the set of string values. A string value is a (possibly empty) sequence of bytes.

Conversions

Conversions to and from a string type

Converting a slice of bytes to a string type yields a string whose successive bytes are the elements of the slice.

string([]byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'})   // "hellø"
string([]byte{})                                     // ""
string([]byte(nil))                                  // ""

type MyBytes []byte
string(MyBytes{'h', 'e', 'l', 'l', '\xc3', '\xb8'})  // "hellø"

Converting a value of a string type to a slice of bytes type yields a slice whose successive elements are the bytes of the string.

[]byte("hellø")   // []byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'}
[]byte("")        // []byte{}

MyBytes("hellø")  // []byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'}

A string value is a (possibly empty) sequence of bytes. A string value may or may not represent Unicode characters encoded in UTF-8. There is no interpretation of the bytes during the conversion from byte slice to string nor from string to byte slice. Therefore, the bytes will not be changed and the conversions will not fail.