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Truthy and falsey values

A truthy value is a value that is considered true for an if, unless, while or until guard. A falsey value is a value that is considered false in those places.

The only falsey values are nil, false and null pointers (pointers whose memory address is zero). Any other value is truthy.

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https://crystal-lang.org/docs/syntax_and_semantics/truthy_and_falsey_values.html