Purpose of Kotlin's safe call (`?.`) and Elvis (`?:`) operators?
This tests your grasp of Kotlin's null safety philosophy. A good answer defines the safe call (`?.`) for conditional access and the Elvis operator (`?:`) for default values, then combines them. A red flag is using verbose `if/else` checks for simple cases.
This question tests your grasp of Kotlin's core philosophy for preventing `NullPointerException`s at compile time. A strong answer first defines the safe call (`?.`) for conditional chaining and the Elvis operator (`?:`) for providing a default value. Then, it combines them in a concise example like `user?.name?.length ?: 0`. The biggest red flag is suggesting the non-null assertion operator (`!!`), which defeats the purpose of null safety.
Read the original → kotlinlang.org
- #kotlin
- #android
- #null safety
- #operators
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