Byte slice/array and string interconversion in Golang

By Stefan Nilsson

The original url: yourbasic.org/golang/conv…

Basic cognitive

Converting between a string and a byte slice (an array) yields a brand new slice that contains the same bytes as the string and vice versa.

• Transformations do not modify the data
• The only difference is that strings are immutable, while byte slices can be modified

If you need to manipulate the rune of a string, you may need to convert the string to a rune slice. See runes and string interconversion in Golang for more details.

Slice a string into bytes

When you convert a string to a byte slice, you get a new slice containing the same bytes as the string.

b := []byte("ABC euro")
fmt.Println(b) // [65 66 67 226 130 172]
Copy the code

Note that the character €is encoded using 3-byte UTF-8. For more information on UTF-8 encoding of Unicode code points, see this article on RUNe.

Slicing bytes into strings

When you convert part of a byte to a string, you get a new string that contains the same bytes as the segment.

S := string([]byte{65, 66, 67, 226, 130, 172}) fmt.println (s) // ABC€Copy the code

performance

These transformations create a new slice or string, so the time complexity is proportional to the number of bytes processed.