How to check if the character is alphanumeric in GO

Understanding Characters in Go as Bytes

In Go, a string is equivalent to a slice of bytes.

Solution: Checking if a Character is Alphanumeric

To determine whether a character is alphanumeric (i.e., a letter or a digit), you can create a function that checks the byte value of the character.

Here’s an example implementation:

package main



func isAlphaNumeric(c byte) bool {

    // Check if the byte value falls within the range of alphanumeric characters

    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9')

}



func main() {



    isAlphaNumeric('a') // true



    isAlphaNumeric('2') // true (digits are also considered alphanumeric)



    isAlphaNumeric('#') // false

}

In the isAlphaNumeric function:

We check if the byte value c corresponds to a lowercase letter ('a' to 'z'), an uppercase letter ('A' to 'Z'), or a digit ('0' to '9').

If the condition is met, we return true; otherwise, we return false.

Let me know if you have an alternative solution or learned something from this post.