Rubiscape provides loop control statements or conditions that you can use to control the execution of your workbook. They are,

1. If Else-End

2. While-End

You can apply the If Else and While conditions as predecessors to the algorithms to decide the execution flow. 
The if-else condition decides execution flow based on whether the specified condition results in True or False. The while loop helps to execute a particular flow until the condition is true.
In both cases, the condition is checked before execution, and based on the outcome, the respective block of statements is executed.
You can use the loop control statements in scenarios where you want to execute different tasks based on certain conditions.