January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Delegated properties
Kotlin enhances the concept of properties to promote code reuse and make the developer coding task easier. There are many repetitive code snippets you and I could write. Ideally, we should have the following functionality out-of-the-box:
- A property value should be computed lazily on its first ever access.
- Notify the listeners of a change to one of the values of properties. Have you ever coded in C#? If yes, I am sure the
INotifyPropertyChangeinterface will come to mind. - Use a map to store your fields rather than a materialized field.
Well, good news! Kotlin's delegate properties support all of these. We deal quite often with types for which we need an identifier:
interface WithId { val id: String } data class WithIdImpl(override ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.