Billjk questions

• Print the concatenation of the digits of two numbers in Python
• attr_reader in Python
• Weird C Compiler, getting an error "ld: duplicate symbol _main"
• Ruby vs. Ruby On Rails
• if statement in javascript always true
• Global and Local and Private Functions (Javascript)
• Python Dictionary
• Struct.Error, Must Be a Bytes Object?
• Set Popping (Python)
• The 'upto' method in Ruby

Billjk answers