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Ruby Programming
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Ranges as Intervals

A final use of the versatile range is as an interval test: seeing if some value falls within the interval represented by the range. This is done using ===, the case equality operator.

(1..10)    === 5 true
(1..10)    === 15 false
(1..10)    === 3.14159 true
('a'..'j') === 'c' true
('a'..'j') === 'z' false

The example of a case expression on page 81 shows this test in action, determining a jazz style given a year.
Ruby Programming
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