Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Ruby

John Steer-Fowler
PLUS
John Steer-Fowler
Courses Plus Student 11,734 Points

Accessing an Array of Hashes - Can anyone help?

I am currently creating a Ruby program and have run into an issue that I am unable to solve.

I have an array of hashes that holds a lot of the information in my program. For example:

array = [{ name: "Jack", gender: "Male", age: 30 }, { name: "Wendy", gender: "Female", age: 42 }, { name: "Julie", gender: "Female", age: 29 }]

I know that I can access the individual hashes like so:

array.each do |person|
   puts person[:age]
end

What I am trying to achieve is to find out which value of the 'age' key is the highest, and then assign that age to a variable called 'highest_age'

I have been trying something like this:

age = array.select { |person| person[:age] }
highest_age = age.max

This is not working for me. Can anybody help at all? Would appreciate any help.

The result should be that the 'highest_age' variable contains the integer 42 as that is the highest age of the three ages I have in my array.

Thanks in advance

Jason Seifer - would appreciate your help if no one else can help.

3 Answers

Hi John, You can access the youngest person with this:

oldest = array.max_by {|person| person[:age]}

=> {:name=>"Wendy", :gender=>"Female", :age=>42}

But to access the value of the :age key, use this:

highest_age = array.max_by do |person| person[:age] end[:age]

=> 42

John Steer-Fowler
John Steer-Fowler
Courses Plus Student 11,734 Points

Sam, what has taken me 3 hours of tinkering you have solved in 20 seconds...

Thank you kind sir :D and thank you max_by Enumerable!

John, I realized I had labeled that first snipped "youngest", rather than oldest. I also edited my answer to yield the final answer 42. Refresh the page and it should come up.

John Steer-Fowler
John Steer-Fowler
Courses Plus Student 11,734 Points

I guessed you meant 'oldest', so don't worry :D

Thank you Sam. I would like to buy you a drink :P

Look me up next time you're in Portland, OR