puts 'foo'.class #=> String
puts 1234.class #=> Integer puts 0b101.class #=> Integer puts 0o30071.class #=> Integer puts 0x4d2.class #=> Integer
puts :bar.class #=> Symbol
puts true.class #=> TrueClass puts false.class #=> FalseClass
puts 12.34.class #=> Float puts 1.234e2.class #=> Float
puts nil.class #=> NilClass
Some other programming languages use primitive data types mainly for performance purposes (as creating objects has an additional overhead comparatively). However, Ruby opts for a purely object-oriented design, to promote ease-of-learning and familiarity (as objects are used throughout Ruby, and thus, rules applying to objects apply to all of Ruby).
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