Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS

Posted by Egor Bedunkevich
Egor Bedunkevich
643 Points

Concatenation and other values?

I have read that concatenation only works with strings, but I am able to do this..

let language = 12
let someNumber = 124
var firstValue = someNumber + language

1 Answer

Chris Shaw
Chris Shaw
26,676 Points

Hi Egor,

You would be correct, however. What you have above is using Maths (addition) therefore what you've read is correct as your adding the values 12 and 124 together. If you had a string an a number you would need to use string interpolation as the compiler can't append a value if it's type is Int for example.

// Good
var total = 12 + 124

// Bad
var total = "Number: " + 12

// Good
var total = "Number: \(12)"

Hope that helps.