Classes and objects

The essential idea

Classes and objects makes a Kotlin program more expressive while keeping the code readable. Identify the value, the rule, and the result before you try to remember the syntax.

Run a tiny experiment

Read top to bottom, then run the code and use its output as evidence.

// Explore classes with one small program.
val value = 0
println(value)

Output:

0

A practical habit

For Classes and objects, run a very small example and change only one part. The compiler and output will show whether your explanation is correct.

Quick check

Quick check: How should you practise Classes and objects?

• Run a focused small program.
• Memorize without compiling.
• Ignore errors.