# 
#  Overview
The **`IndexRune()` function** is used to find the index of the first appearance of Unicode code character in a string.

We import the `strings` package in the file. We access the `IndexRune()` function with dot (`.`) notation (`string.IndexRune()`).
##  
## Syntax


```
func IndexRune(str string, r rune) int
```



# 
#  Parameters

This function takes two arguments:

- **`str`**: This argument is of type `string`. It represents the list of characters you want to search.

- **`r`**: This represents the `rune` value of the Unicode character you want to find in the `str`.

# 
## Return value
 **`int`**: The returned value is the index of the first instance of a Unicode character. It matches the `rune` value `r`. If there is no such character in the whole string, then `-1` is returned.


## 
## Example

package main
import (
	"fmt"
	"strings"
)
func main() {
	str := "This is a greek letter α is used often in mathematics"
	x := strings.IndexRune(str, 108)
	// 108 is the rune value of l
	fmt.Println(" The letter \"l\" first appears at position: ", x)
}

#  Explanation
 We use the `IndexRune()` function to find the position of the letter '**`l`**'. The `rune` value of 108 represents that.

##
## Example 



package main
import (
	"fmt"
	"strings"
)
func main() {
	str := "Educative Inc."
	x:= strings.IndexRune(str, 108) 
	// 108 is the rune value of l
	if x == -1{
		fmt.Print("could not find any \"l\" in : \"",str, "\"" )
	}
}

What is the IndexRune() function in golang?

Finds the index of the first instance of a Unicode character in a string; returns -1 if absent.