gistfile1.rb

goal: 
-----
return an array of names that start with j and sorted by id
["josh", "jordan"]


arr = [{name: 'jordan',id: 3}, {name: 'josh',id: 1}, {name: 'rob',id: 5}]

1)
arr.select!{ |a| a[:name][/\Aj/] }
arr.sort!{ |a,b| a[:id] <=> b[:id] }
arr.map!{ |a| a[:name] }

2) 
arr.select!{ |a| a[:name][/\Aj/] }.sort!{ |a,b| a[:id] <=> b[:id] }.map!{ |a| a[:name] }

3)
arr.sort!{ |a,b| a[:id] <=> b[:id] }
arr = arr.inject([]) do |array_so_far, current_item|
        array_so_far << current_item[:name] if current_item[:name][/\Aj/]
        array_so_far
      end