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Asked: 2026-05-31T01:53:04+00:00

In Ruby, why are the following lines true? 0 && 1 == 1 1

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In Ruby, why are the following lines true?

0 && 1 == 1
1 && 0 == 0

Why are they different and aren’t both 0?

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1 Answer

  1. Editorial Team

    Boolean AND operator && returns its second operand if first is not false. 0 and 1 are true in boolean expressions in Ruby. Only nil and false are false in boolean expressions.

    nil && 15 # => nil
15 && 17 # => 17
15 && nil # => nil
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