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Check If the Rune is a Lowercase Letter or not in Golang
  • Last Updated : 27 Sep, 2019

Rune is a superset of ASCII or it is an alias of int32. It holds all the characters available in the world’s writing system, including accents and other diacritical marks, control codes like tab and carriage return, and assigns each one a standard number. This standard number is known as a Unicode code point or rune in the Go language.
You are allowed to check the given rune is a lower case letter or not with the help of IsLower() function. This function returns true if the given rune is a lower case letter, or return false if the given rune is not a lower case letter. This function is defined under Unicode package, so for accessing this method you need to import the Unicode package in your program.

Syntax:

func IsLower(r rune) bool

The return type of this function is boolean. Let us discuss this concept with the help of given examples:

Example 1:

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// Go program to illustrate how to check
// the given rune is a lowercase letter
// or not
package main
  
import (
    "fmt"
    "unicode"
)
  
// Main function
func main() {
  
    // Creating rune
    rune_1 := 'g'
    rune_2 := 'e'
    rune_3 := 'E'
    rune_4 := 'k'
    rune_5 := 'S'
  
    // Checking the given rune is 
    // a lower case letter or not
    // Using IsLower() function
    res_1 := unicode.IsLower(rune_1)
    res_2 := unicode.IsLower(rune_2)
    res_3 := unicode.IsLower(rune_3)
    res_4 := unicode.IsLower(rune_4)
    res_5 := unicode.IsLower(rune_5)
  
    // Displaying results
    fmt.Println(res_1)
    fmt.Println(res_2)
    fmt.Println(res_3)
    fmt.Println(res_4)
    fmt.Println(res_5)
  
}

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Output:

true
true
false
true
false

Example 2:

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// Go program to illustrate how to check
// the given rune is a lowercase letter
// or not
package main
  
import (
    "fmt"
    "unicode"
)
  
// Main function
func main() {
  
    // Creating a slice of rune
    val := []rune{'g', 'E', 'e', 'K', 's'}
  
    // Checking each element of the given slice
    // of the rune is a lowercase letter
    // Using IsLower() function
    for i := 0; i < len(val); i++ {
  
        if unicode.IsLower(val[i]) == true {
  
            fmt.Printf("\n%c is a lower case letter", val[i])
              
        } else {
          
            fmt.Printf("\n%c is not a lower case letter", val[i])
        }
    }
}

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Output:

g is a lower case letter
E is not a lower case letter
e is a lower case letter
K is not a lower case letter
s is a lower case letter



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