Deadbeef questions

Deadbeef answers

• Nullpointer with singleton and factory pattern
• Run gradle build(test) in subprojects in a custom task
• Multiply an int by 30, 31, 32 - are these really optimized by the compiler? (effective java says so)
• Why is this borrow still "active"?
• How can I pattern match against an Option<String>?
• Increment an integer Map value in Kotlin
• CallSite explanation needed