Web Reference: Jul 11, 2025 · The while and for loops are entry-controlled, meaning the condition is evaluated before executing the loop body. On the other hand, the do..while loop is exit-controlled, ensuring the loop body is executed at least once. The Ruby while and until loops repeatedly execute a block of code based on a condition. In this tutorial, you’ll learn about the Ruby while and until loops with examples. A while loop's conditional is separated from code by the reserved word do, a newline, backslash \, or a semicolon ;. This will produce following result: Executes code while conditional is true.
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