From: Robert Klemme <shortcutter@...>
Date: 2011-01-18T22:22:09+09:00
Subject: Re: Hash keys exist?

On Tue, Jan 18, 2011 at 11:05 AM, Benjamin Fowl <b.fowl87@gmail.com> wrote:
> Is there a way of checking whether a group of keys exist within a hash.
>
> For example you have the following hash
>
> example = {:profile => { :name => "John",
>                                            :username =>
> "johnny_bravo"},
>                     :example1 => { :var1 => "test",
>                                               :var2 => "test2" }
>                     }
>
> now all you want is a function that can be passed an array of required
> keys
> eg req = [:name, :username, :var1]
>
> this array can contain any number of required keys is not always just
> keys that are in either the profile or example1 sub hashes.

irb(main):001:0> example = {
irb(main):002:1*   :profile => { :name => "John",  :username => "johnny_bravo"},
irb(main):003:1*   :example1 => { :var1 => "test", :var2 => "test2" },
irb(main):004:1* }
=> {:profile=>{:name=>"John", :username=>"johnny_bravo"},
:example1=>{:var1=>"test", :var2=>"test2"}}

irb(main):005:0> [:name, :username, :var1].all? {|k| example.has_key? k}
=> false
irb(main):006:0> [:profile, :example1].all? {|k| example.has_key? k}
=> true

Cheers

robert

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