Kaplan questions

Kaplan answers

• How to take ownership of Any:downcast_ref from trait object?
• Why does Iterator::take_while take ownership of the iterator?
• Why does my CompletableFuture code run in Java 8 but not in Java 11?
• Conversion of collection to int array
• Make a string from an IntStream of code point numbers?
• How to remove first and last character of a string in Rust?
• How to write comparator to sort 2D array based on second column using lambda expression