Golang和UTF-8中的符文[关闭]

Question

1. What does "rune" mean?

2. https://golang.org/pkg/unicode/utf8/#example_Valid Why is the answer is true in the first line?

3. The function Valid accepts only an array?

Answer 1

1. rune is an alias for the type int32. It is intended to make programs clear about the cases when an integer value represents a code point.
2. Because the sequence of bytes 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0xe4, 0xb8, 0x96, 0xe7, 0x95, 0x8c (which is a representation of the utf-8 string Hello, 世界) is a valid UTF-8 sequence.
3. While utf8.Valid accepts only array of bytes (there is no overloading in Go, so the "only" part is actually irrelevant), there are a few similar functions to check for validness: utf8.ValidRune and utf8.ValidString

I recommend reading an awesome article on the Go blog: Strings, bytes, runes and characters in Go, I believe after reading it and experimenting a bit you'll get answers to most of your utf8-related questions about Go.