I solved just a few easy problems, but I already feel that I have something to share. One day, I have decided that I need to move on, so I started a new session in Leetcode and switched the compiler to Kotlin. Still, the more I learned about Kotlin, the more I realised how many powerful features I’m missing, and how much boilerplate code I need to write.

Solving algorithmic problems, especially under the time pressure, is very different from Android app development. I didn’t switch to Kotlin for solving problems right away.Īlthough I was writing Kotlin code for several years, I felt that I need to make an extra cognitive effort to get the syntax and the language constructions right. But I didn’t keep track of new Java features, as Android support of Java SDK lagged many versions behind. I didn’t switch to Kotlin because I know the syntax of Java 6 so well, that I could effortlessly write code without autocompletion and syntax highlighting. Since then, I spent three years writing Kotlin code but rarely utilised all the potential of the language.ĭuring this year, I did more than a hundred coding problems on Leetcode in Java. When I just started learning Kotlin, I was solving Kotlin Koans, and along with other great features, I was impressed with the power of functions for performing operations on collections. 8.I have talked to many Android developers, and most of them are excited about Kotlin. This example shows how even complex operations can be performed easily with Kotlin’s powerful APIs. We’re making use of the with scope function here to keep our code tidy. Val shipments = mapOf('Chocolate' to 3, 'Strawberry' to 7, 'Rocky Road' to 5) We’ll subtract all the entries in the sales map and then add all the entries from the shipments map to update each flavor’s Quantity: val sales = mapOf('Vanilla' to 7, 'Chocolate' to 4, 'Strawberry' to 5) After a day of receiving shipments and selling ice cream, we need to update our store’s inventory map. The forEach method performs an action on each entry in a given map. As a final example, we’ll use what we’ve learned already and introduce the forEach method.

Mapof kotlin