Liondancer questions

• Coursera Node.js Fibonacci implementation hanging
• Listing resources subdirectory in scala NullPointerException
• copying portion of object array in Java
• Finding index of a dictionary in a list by key value
• Are instance variables necessary for Rails as API only?
• Creating a legend in R with matching color and line shape
• subprocess popen to run commands (HDFS/hadoop)
• ImportError: No module named when module is there
• Adding background image in Rails 4
• Counting number of nodes in a Binary Search Tree

Liondancer answers