Training Plan

Course: https://www.coursera.org/learn/kotlin-for-java-developers

1. Introduction

• List the key characteristics of Kotlin
• Understand the types of tasks where Kotlin can be used

2. Starting up with Kotlin

• Convert Java code to Kotlin automatically
• Define variables and functions
• Use control structures
• Employ ranges
• Explain what is an extension function in Kotlin
• Define and use extensions

3. Nullability, Functional Programming

• Distinguish nullable types and non-nullable types
• Use different ways to perform an action only when a value of a nullable type is not null
• Prefer safe operations for nullable values
• Employ functional programming style for manipulating collections
• Use function types
• Choose the right form of return expression for returning from lambda

4. Objectives

• Distinguish between different kinds of properties: without backing field, lazy, lateinit
• Summarize the differences in defining and using classes with Java
• Know the different syntax for constructors
• Use different kinds of classes for correct situations: enum, data, inner, sealed
• Use annotations to improve Java interoperability
• Explain the difference between object expression and object declaration
• Show the benefits of companion objects over static methods
• Give examples of using conventions in the standard library
• Employ conventions for your own classes

5. Sequences, Lambdas with Receiver, Types

• Use short simple function from the standard library
• Explain why simple library functions bring no performance overhead
• Demonstrate how inlining works
• Describe the difference between operations on Collections and operations on Sequences
• Convert a chained call from Collections to Sequences
• Recognize lambdas with receiver in the code: in the standard library and different DSLs
• Illustrate in what sense lambdas with receiver are similar to extensions
• Show the Kotlin type hierarchy
• Explain the difference between Unit and Nothing types
• Recognize platform types: the types that came from Java
• Prevent NPEs for mixed Kotlin and Java code