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 Swift Collections and Control Flow Dictionaries in Swift Working With Dictionaries

Posted by luke parker
luke parker
489 Points

Having trouble retrieving a value from a dictionary

Not sure what I'm doing wrong here. Please help!

dictionary.swift 
// Enter your code below
var iceCream: [String:String] = ["CC": "Chocolate Chip", "AP": "Apple Pie", "PB": "Peanut Butter"]

iceCream.removeValue(forKey: "AP")

2 Answers

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points
Brendan Whiting
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points

There's an important difference between retrieving and removing. Retrieve finds the element and returns it, but the array is not affected. Remove actually changes the array eliminating that element and returns the value.

It wants you to just retrieve, which you do with [] subscripting rather than the removeValue method.

luke parker
luke parker
489 Points
luke parker
luke parker
489 Points

I see. Thanks!