如何将utf8文字（即'\ u1F606'）转换为符文？ （不要从符文获取UTF8！）

Question

I'm trying to generate sequential characters using the utf8 hex codes. For example first part, I'm terming "base" code : 259 second part, Im' terming "end" code : 1 (or, 2, or A, or F, etc)

These are coming in as strings. Once I append the end code and get a complete string (ie: 259E), how can I convert that into the actual utf8 representation (or "character")

I'm not sure where to start. I know that string(rune('\u259E') will give me the representation ( ▞), but I don't know how to get the string into the rune cast as a (single-quoted) utf8 character code.

package main

import "fmt"

func main() {
    s1 := "259"
    s2 := "E"
    s3 := "\\u"+s1+s2
    fmt.Println(s3)
    fmt.Println(string(rune('\u259E'))) 
}

The desired outcome is that I'm able to return a utf8 character (and potentially surrogate pairs) from generated string representations of the codes.

The overall gist (for example) is that I'd like the string value "272A" to return as : ✪

Answer 1

Parse the hex value into an int32.

Then cast that value to a rune in the println.

package main

import "fmt"
import "strconv"

func main() {
    s1 := "259"
    s2 := "E"
    s3, err := strconv.ParseInt(s1+s2, 16, 32)
    fmt.Println(string(rune(s3)))
    fmt.Println(err)
}