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Ruby Programming
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A literal Ruby Hash is created by placing a list of key/value pairs between braces, with either a comma or the sequence => between the key and the value. A trailing comma is ignored.

colors = { "red"   => 0xf00,
           "green" => 0x0f0,
           "blue"  => 0x00f

There is no requirement for the keys and/or values in a particular hash to have the same type.
Ruby Programming
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