Kotlin / Language foundations and explicit state

Kotlin β€” Language foundations and explicit state

Develop values, control flow, nullability, collections, classes, and failure boundaries.

6 lessons Β· No account required

What you will learn

  • Predict small programs and distinguish syntax, types, and domain validation.

  1. Run a Kotlin program and reason about values

    Understand a JVM-oriented entry point, val and var, inferred types, arithmetic, and explicit conversions.

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  2. Express decisions and reusable functions

    Use if and when expressions, ranges, loops, named arguments, and explicit function contracts.

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  3. Represent absence with nullable types

    Use smart casts, safe calls, Elvis expressions, and nullable parsing without replacing domain meaning with unchecked assertions.

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  4. Choose collections and transform them deliberately

    Use lists, sets, maps, read-only views, filtering, and mapping while preserving order and ownership meaning.

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  5. Model state with classes and data classes

    Use constructors, init validation, properties, equality, and copy while respecting encapsulation and shallow state.

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  6. Separate validation, exceptions, and cleanup

    Use require, check, try expressions, narrow catches, and finally while keeping expected input failures explicit.

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