The unless modifier is a conditional evaluation appended to the end of Ruby statements that performs the opposite type of evaluation as the if modifier.

Name: The unless modifier is a conditional evaluation appended to the end of Ruby statements that performs the opposite type of evaluation as the if modifier.
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The unless modifier in Ruby performs the opposite evaluation as the if modifier, making the statement true only if the condition is false.

The Unless Modifier Is a Conditional Evaluation Appended to the End