Exercise 11.2.1 Write a function repeatLoop with also additional syntax for an until clause.
The repeat { command } until (condition) was tricky. The trick is to realize that "until" would be a method call, and for it to be a method call, "repeat {command}" would have to be an object. Since objects are created using new, we could wrap this object creation with a method. The result is below. Note that the second method has been changed to repeatUntilLoop since it would conflict with the previous method repeatUntil.
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