Web Reference: Don't use return in a block. Just remove both return and your code will be ok. You can't return inside a block in Ruby *. The last statement becomes the return value, so you can just remove the return statements in your case: (1...denom).collect{|num|. r = Rational(num, denom) if r > Rational(1, 3) and r < Rational(1, 2) 1 else 0 end . Jan 12, 2026 · LocalJumpError: unexpected return is a common pitfall when using return in procs or blocks defined outside methods. By understanding Ruby’s scoping rules for return, and using solutions like implicit returns, lambdas, or throw / catch, you can resolve this error. Ruby method returns unexpected value Helpful? Please use the Thanks button above! Or, thank me via Patreon: / roelvandepaar !
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