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.

iOS Intermediate Swift 2 Properties Computed Properties

Boris Likhobabin
Boris Likhobabin
3,581 Points

What the setter in computed value tells us?

var celsius: Double = 0

var fahrenheit: Double {
get {
    return (celsius * 1.8) + 32
} set myValue { 
    (myValue - 32 ) / 1.8

fahrenheit // prints 32

In this example: We use get intuition tells "this is how we get the fahrenheit property, we take celcius ...." but with a setter I'm a little confused: Say we want to set the fahrenheit to the value of newValue and we do , but why we need to do the opposite (converting this new value back to celcius in the setter block? WHAT IS THE POINT OF THIS? Thanks in advance