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iOS Build a Weather App with Swift (Retired) Pulling Data From the Web Creating a URL

Frank Shi
Frank Shi
1,859 Points
Posted by Frank Shi
Frank Shi
1,859 Points

Why always "You need to convert the courseID variable to a string and use it when creating courseURL.... "

I was using 

let courseID = 25
let treehouseBaseURL = NSURL(string: "https://api.teamtreehouse.com/");
let courseURL  = NSURL(string:"course/COURSE_\(courseID)" , relativeToURL: treehouseBaseURL );

which should be correct.

2 Answers

Chris Shaw
Chris Shaw
26,676 Points
Chris Shaw
Chris Shaw
26,676 Points

Hi Frank,

The constant courseID isn't being converted to a String per say, what we're doing is using interpolation as explained in Swift Basics: Strings.

The actual value for courseID doesn't change but instead get's concatenated onto the courseURL url string.

Hope that helps.

Frank Shi
Frank Shi
1,859 Points
Frank Shi
Frank Shi
1,859 Points

Thanks Chris, I believe this is a bug in the challenge system, when i use: let courseURL = NSURL(string:"course/COURSE_\(courseID)" , relativeToURL: treehouseBaseURL ); it will fail and when i changed to let courseURL = NSURL(string:"course/\(courseID)" , relativeToURL: treehouseBaseURL ); it works.