Swift 2 - Appending string to string (concatenation)

Question

I'm trying to extract values out of an array and concatenate all the values in one string like the following

var ingredient: String

for tag in tags {
   if let text = tag.titleLabel?.text {
      ingredient += " \(text)"
   }
}

recipe.ingredients = ingredient

But I Xcode complains:

Variable "ingredient" passed by reference before being initialized

I think it complains that ingredient is initialized but has no value to start with for concatenation. Is that right? How can I achieve what I want?

Eendje · Accepted Answer · 2016-03-13 05:28:48Z

1

recipe.ingredients = tags.flatMap { $0.titleLabel?.text }.joinWithSeparator(" ")

Not exactly the same, but this way it's safe and in one line.

answered Mar 13, 2016 at 5:28

Eendje

8,8931 gold badge31 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Seong Lee Over a year ago

This turns out to be exactly what I wanted. I think my approach was failing and will fail 99% because it won't have value until user put some value, is that right? I'm just trying to learn :)

Eendje Over a year ago

To be exact, it will fail 100% :). Basically, you can't use the variable before it is initialized.

Collectives™ on Stack Overflow

Swift 2 - Appending string to string (concatenation)

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related