Kotlin TutorialLesson 7Free preview

Kotlin Variables

This lesson is part of Kotlin · All levels

Summary

This lesson reviews the declaration of variables in Kotlin using the keywords 'val' and 'var'. Kotlin strongly advocated the concept of immutability, where the value that does not need to be changed should be declared with 'val'. Kotlin's type inference feature also automatically determines the type of variable data without having to be written manually.

Key points

The keyword 'val' is used to declare the read-only (immutable) variable
The keyword 'var' is used for variables whose values are reversible (mutable)
Kotlin supports type inference so data type writing is often optional.
Declaring a variable with 'val' is best practice for code stability

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