Retrieve the values out of a hash based on one or more keys with values_at, also placing the value or values in an array:
zip = { 1 => "One", 2 => "Two", 3 => "Three",
4 => "Four", 5 => "Five", 6 => "Six", 7 =>
"Seven", 8 => "Eight", 9 => "Eight" }
puts zip.values_at 5
puts zip.values_at 1, 4, 7
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