Lesson 5 / 25

Functions

Explain Functions, run a focused example, and inspect the result.

The essential idea

Functions 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 functions with one small program.
val value = 0
println(value)

Output:

0

A practical habit

For Functions, 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 Functions?

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

Run a focused small program. — Small experiments make cause and effect visible.