What is the purpose of the 'repeatUntil' structure in Karel programming?

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The 'repeatUntil' structure in Karel programming is designed to allow a block of code to be executed repeatedly until a specific condition is met. This means that Karel will continue to perform the instructions within the 'repeatUntil' loop until the designated condition evaluates as true. Once that condition occurs, the execution of the loop stops, allowing the program to proceed beyond that point.

This structure is particularly useful for scenarios where the exact number of iterations is not predetermined. Instead, the loop continues to run until the desired state is achieved, which enhances the flexibility and control of the program's flow. Such a mechanism can be effectively utilized in situations where Karel must navigate a space or make decisions based on its environment, ensuring that the program behaves as intended without requiring hardcoded repetition counts.