August 2017
Intermediate to advanced
440 pages
10h
English
Content preview from Android Development with Kotlin
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The Boolean type
Boolean is a logic type that has two possible values: true and false. We can also use the nullable Boolean type:
val isGrowing: Boolean = true
val isGrowing: Boolean? = null
The Boolean type also supports standard built-in operations that are generally available in most modern programming languages:
- ||: Logical OR. Returns true when any of two predicates return true.
- &&: Logical AND. Returns true when both predicates return true.
- !: Negation operator. Returns true for false, and false for true.
Keep in mind that we can only use a not-null Boolean for any type of condition.
Like in Java, in || and && predicates are evaluated lazily, and only when needed (lazy conjunction).
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