Kotlin When Expressions

What is When?

The when expression is used to check multiple conditions.

It replaces switch statements from other languages.

Basic Syntax

Multiple Conditions

Using Ranges

When as an Expression

Without Argument

Full Example

Why When is Important

• Cleaner than if-else
• More readable
• Supports multiple conditions
• Core Kotlin feature

Common Mistakes

• Forgetting else branch
• Incorrect range usage
• Not using when as an expression

Practice

Categorize a number using when.

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