How to convert a string to a rune slice (UTF-32) using strconv in Golang?

To convert a string to a rune slice (UTF-32) using the strconv package in Golang, you can follow these steps:

Import the strconv and unicode/utf8 packages:

import (
    "strconv"
    "unicode/utf8"
)

Define the string you want to convert:

str := "Hello, 世界"

Calculate the length of the string in bytes:

strLen := len(str)

Create an empty rune slice with a capacity equal to the number of characters in the string:

runes := make([]rune, 0, utf8.RuneCountInString(str))

Iterate through the string byte by byte using a for loop:

for i := 0; i < strLen; {
    r, size := utf8.DecodeRuneInString(str[i:])

    // Add the decoded rune to the rune slice
    runes = append(runes, r)

    // Move to the next byte
    i += size
}

At this point, runes will contain the UTF-32 representation of the string. You can print it for verification:

fmt.Println(runes)

The complete code:

package main

import (
	"fmt"
	"strconv"
	"unicode/utf8"
)

func main() {
	str := "Hello, 世界"
	strLen := len(str)
	runes := make([]rune, 0, utf8.RuneCountInString(str))

	for i := 0; i < strLen; {
		r, size := utf8.DecodeRuneInString(str[i:])
		runes = append(runes, r)
		i += size
	}

	fmt.Println(runes)
}

This code will convert the string "Hello, 世界" to a rune slice [72 101 108 108 111 44 32 19990 30028].