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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Rational#to_json

to_json(*args)

Stores class name (Rational) along with numerator value n and denominator value d as JSON string

See also #to_i #to_r #to_f #to_s also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1