Welcome to the Treehouse Community
The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Huseyn Guliyev
2,603 PointsError in vend function
Cannot subscript a value of type '[VendingSelection : VendingItem]' with an argument of type '[VendingSelection]'
Here is my code:
class FoodVendingMachine: VendingMachine {
let selection: [VendingSelection] = [.soda, .dietSoda, .chips, .cookie, .sandwich, .wrap, .candyBar, .popTart, .water, .fruitJuice, .sportsDrink, .gum]
var inventory: [VendingSelection : VendingItem]
var amountDeposited: Double = 10.0
required init(inventory: [VendingSelection : VendingItem]) {
self.inventory = inventory
}
func vend( _ quantity: Int, _ slection: VendingSelection) throws {
guard var item = inventory[selection] else {
throw VendingMachineError.invalidSelection
}
}
func deposit(_ amount: Double) {
}
}
1 Answer

Johnny Nguyen
3,875 PointsLook at your function vend():
Do you name your local argument correctly? It should be "selection" instead of "slection".
Huseyn Guliyev
2,603 PointsHuseyn Guliyev
2,603 PointsI already found my mistake but thanks anyways!