I have this variable:
danumber := "542353242"
and want to extract a character from the string and operate with it as a number. Tried this:
int(danumber[0])
but it doesn't seem to work.
What your expression gives you is the character code for the digit. To convert the character to the character's value, subtract 0's character code from it:
int(danumber[0] - '0') // in your example, this is: 53 - 48
If you want to convert multiple digits, I would recommend using the strconv package:
number, err := strconv.Atoi(danumber[0:2]) // convert first two characters to int