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 Enums and Structs Structs and their Methods Struct Methods

Tim Hancock
Tim Hancock
3,254 Points
Posted by Tim Hancock
Tim Hancock
3,254 Points

How do I call a method on a variable?

I'm struggling with the last part of this code challenge. How do I call a function in a struct and assign it to a new variable?

struct.swift 
struct Expense {
    var description: String
    var amount: Double = 0.0

    init (description: String) {
        self.description = description
    }


    func calculateTaxes(percentage: Double) -> Double{
    return self.amount * (percentage/100)}
    }

    var item = Expense(description: "Booger")
item.amount = 100

1 Answer

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello:

What you want to do is call the function, and the function will return a value. This value can then be assign to a variable. 

// If you have an instance of the struct

var item = Expense(description: "Booger")

// then you can call the function 

var newVariable = item.calculateTaxes(7.0)

Hope this small explanation helps you