Lectures

In this lecture, you’ll learn how the information revolution changed the world, why IT companies became the largest and most valuable, what prospects a job in IT opens up, and why now is the best time to become a programmer. Examples, numbers, and inspiring facts!

In this lecture, you will explore the integer type Int in Kotlin: the range of values, declaring variables using var, assignment, initialization, basic arithmetic operations, division and remainder, as well as increment and decrement. Along the way, you will see examples and learn important Kotlin-vs-Java differences in declaration syntax.

In this lecture you will get to know the String type in Kotlin: you will learn how to declare and initialize string variables, perform concatenation with +, escape special characters, use basic string properties and methods, and also apply string templates with $ and ${...} for convenient substitution of values and expressions.

In this lecture you will learn how Kotlin performs conversions between types: how to get a String from an Int, how to turn a string into a number using toInt(), and how to safely parse user input via toIntOrNull() and the Int ? type. You will also get a handy cheat-sheet table and an explanation of why the language requires explicit conversions.

In this lecture, we will break down how RAM works and how variables are laid out in Kotlin (on the JVM): what a cell address is, why the data type matters, how primitive numeric types differ from the String object, what exactly gets copied during assignment, and why programming so often counts from zero.

In this lecture, you will learn how to read input in Kotlin via standard input: how to read strings using readln() and readLine(), why you need trim(), how to convert strings to numbers using toInt(), toDouble() and toIntOrNull(), and how to debug input (quotes, spaces, string length).

Get to know how the JavaRush platform is built: how courses and the university are organized, what quests and modules are, how the system of levels, lectures, and tasks works, why “black matter” is needed, where to find help, and how to study from your phone. This lecture is your guide to JavaRush features!