Swift 4 : Unable to convert Character to String

Question

I'm extracting a number out of string of numbers in a character but unable either to convert that character to string or to int. Here is my code:

func processString(_ s: String) ->Bool { var sum = 0 for char in s{ let number = String(char){ //error Cannot invoke initializer for type 'String' with an argument list of type '(Character, () -> ())' } } }

if I try to converted to Int:

func processString(_ s: String) ->Bool { var sum = 0 for char in s{ let number = Int(String(char)){ //Cannot invoke initializer for type 'Int' with an argument list of type '(String, () -> ())' } } }

Any of you knows what I'm doing wrong or why can not convert the character to string or int?

I'll really appreciate your help.

Joel Bell · Accepted Answer · 2018-09-06 20:10:29Z

You have some extra { } brackets in there that are not necessary. Removing those should solve the compiler issues.

func processString(_ s: String) ->Bool { var sum = 0 for char in s{ let charString = String(char) print(charString) } }

On this next example, since the Int(_ string: String) initializer can return nil, you could use an if let statement to unwrap the result, which looks like what you may be trying to do with the { } It would look like this:

func processString(_ s: String) ->Bool { var sum = 0 for char in s{ if let number = Int(String(char)) { // number is not nil } } }

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