0x10. String in Golang

String in Go

len function

len is a universal function to find length of any data type, it’s not particular to strings. We will learn about more Go’s built-in functions in upcoming tutorials.

rune

https://golang.org/doc/go1#rune Rune is a Type. It occupies 32bit and is meant to represent a Unicode CodePoint.

Analyze Xin chầo

• Convert hexa E1BAA7 to binary is 11100001.10111010.10100111
• Convert 11100001.10111010.10100111 to code point (char code) 11100001.10111010.10100111 => 1111010100111
• 1111010100111 => 7847 => 1EA7

r := []rune("ầ")
fmt.Printf("\n%x", r[0])
fmt.Printf("\n%v", r[0])

https://play.golang.org/p/SzW4eKZNlkW

console.log("ầ".charCodeAt(0))

UTF-8

Number of bytes	Bits for code point	Firstcode point	Lastcode point	Byte 1	Byte 2	Byte 3	Byte 4
1	7	U+0000	U+007F	0xxxxxxx
2	11	U+0080	U+07FF	110xxxxx	10xxxxxx	10xxxxxx
3	16	U+0800	U+FFFF	1110xxxx	10xxxxxx	10xxxxxx
4	21	U+10000	U+10FFFF	11110xxx	10xxxxxx	10xxxxxx	10xxxxxx