hey mike questions

• how to know a total commit of a collaborator
• how to compare to previous item in `each` iterator?
• What's the difference between the three linux-image variants in Ubuntu?
• how to ssh into a remote host and execute a command immediately
• activerecord - how to get all column of joined tables
• What does Post.all.map(&:id) mean? [duplicate]
• What's the difference between to_a and to_ary?
• how to undo bundle update

hey mike answers