To find the index of the first occurrence of a character in a string in Golang, you can use the strings.Index() function. Here is an example:
package main
import (
"fmt"
"strings"
)
func main() {
str := "Hello, World!"
char := 'o'
index := strings.IndexRune(str, char)
if index != -1 {
fmt.Printf("The index of the first occurrence of '%c' in '%s' is %d\n", char, str, index)
} else {
fmt.Printf("'%c' not found in '%s'\n", char, str)
}
}
In this example, strings.IndexRune() function is used to find the index of the first occurrence of the character 'o' in the string "Hello, World!". The function returns the index of the character or -1 if the character is not found.