grautur questions

• Safely adding a `sum` method to Array class
• How to convert Map[A, B] into a key-value string sorted by String?
• How do I rsync a file to a remote directory that doesn't exist?
• Advantage of using "x *= -1." over "x *= -1"?
• How do I create a series of high- and low-pitch beeps using Ruby or Python? [closed]
• How to use Hadoop Streaming with LZO-compressed Sequence Files?
• Pulling data from MySQL into Hadoop
• Amazon Book API for Python or Ruby? [duplicate]
• wrong argument type String (expected Array)
• Launching R gui from the command line and setting the working directory to the current folder

grautur answers