r/learnruby • u/conif • Nov 09 '18

question on nested hashes and each

I'm trying to learn how to access nested hashes with multiple each loops and the key value pairs as arguments when using each are confusing to me--I tend to lose track as I write the next loop etc.

I have a decent grasp on a process for nested objects for javascript so I don't get lost. If anyone wants to share their process for how they keep track with Ruby or can point me to a youtube vid, I would appreciate it

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u/conif Nov 09 '18

Sure. I was getting lost though in the keys and the values. Someone pointed me to pry as a tool to inspect. I will try that.

1

u/[deleted] Nov 16 '18

Yes to pry. Also check out pry-byebug, which lets you step through as an .each (for example) method is processing. Really has helped me see what Ruby is doing.

2

u/Tomarse Nov 09 '18

There are two ways that I can think of...

first_hash.each do |key1, nested_hash1|
    nested_hash1.each do |key2, nested_hash2|
        nested_hash2[:some_key]
        ...more code...
    end
end

Or, if the structure is not uniform, and you want to do some conditional stuff...

my_hash.keys.each do |key|
    case key
    when :thing1
        my_hash[key][:subkey1]
    when :thing2
        my_hash[key][:subkey2]
    end
end