CODEWITHSUNDEEP
swift
eharo2
eharo2

Reputation: 2642

Why ReturnType is not working in this Swift function?

I am working with Swift 5, in Xcode 10.2.1

I have this function inside of an extension of UInt8

The compiler complains in line 5, with Unexpected non-void return value in void function

The return type is properly defined, and if the line return "\(opCode)" is commented, it works fine, with the return in the last line return "\(OpCode.NOP) I am using "\(OpCode.NOP)" to avoid adding another variable to the enum, but is a regular string

The error continues if I change the line to return "", so it has nothing to do with the OpCode enum.

extension UInt8 {
    func opCode() -> String {
        OpCode.allCases.forEach { opCode in
            if self == opCode.uint8 {
                return "\(opCode)"  //Unexpected non-void return value in void function
                //return ""  // Error persists
            }
        }
        return "\(OpCode.NOP)"
    }
}

Upvotes: 0

Views: 123

Answers (1)

Shehata Gamal
Shehata Gamal

Reputation: 100503

You can't return a value inside void return type of the forEach instead try

extension UInt8 {
    func opCode() -> String { 
       if let item = OpCode.allCases.first(where:{ self == $0.uint8 }) { 
         return "\(item)"
       } 
        return "\(OpCode.NOP)"
    }
}

Upvotes: 1

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