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2.3 Predicates

Procedure: rope-null? rope ¶

True if rope is empty, and otherwise false. There is only one empty rope, and that is the empty string itelf. This procedure is provided because string-null? will throw an exception if it is passed a rope.

Procedure: rope-balanced? rope ¶

True if the rope is balanced, and otherwise false. A rope of length ℓ and depth d is balanced when ℓ ≥ Fib(d) where Fib is the Fibonacci sequence.