Suppose you want a hash with keys from an array and values from another array, use something like
ruby> ids = [1,2,3,4]
=> [1, 2, 3, 4]
ruby> names = ['Dan Brown', 'Stella', 'Parker']
=> ["Dan Brown", "Stella", "Parker"]
ruby> Hash[ids.zip names]
=> {1=>"Dan Brown", 2=>"Stella", 3=>"Parker", 4=>nil}
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