/Swift/Left side of mutating operator isn't mutable: 'self' is immutable

Left side of mutating operator isn't mutable: 'self' is immutable

   mutating func nextQuestion(){ // add "mutating" before func to change value of variables from (the struct)
        if questionNumber + 1 < questions.count { // to count answered questions
            questionNumber += 1
        }else{
            questionNumber = 0
        }
    }

Similar codes

3 votes312 views1 answer
Swift stirng to date
Swift
0 vote273 views1 answer
Swift out of bound elelemnt
Swift
8 votes411 views2 answers
Date formatter swift
Swift
0 vote296 views1 answer
Swift check if class is of type
Swift
0 vote250 views1 answer
Uitextview placeholder swift
Swift
2 votes288 views1 answer
Swift scrollview hide scrollbar
Swift
0 vote284 views1 answer
Get middle index of center cell in table view swift
Swift
0 vote307 views1 answer
Cifilter image preserve orientation
Swift
1 vote261 views1 answer
Clear userdefaults swift
Swift
1 vote297 views1 answer
How to control the line spacing in UILabel
Swift