MapReduce.init() MapReduce.answer MapReduce.functionDef MapReduce.params MapReduce.functionCall

Given the following function definition, where params:

functionDef

what is the value of the following function call?
functionCall
Note that, if the function call generates an exception, the correct answer is the word "error" (without the double quotes) in all lowercase letters.

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return MapReduce.checkAnswer(guess);

First, determine what the mapper function computes in general, that is, for any input.

Second, determine what the reducer function computes in general, that is, for any input.

Then, determine what the f function returns based on its use of the folding pattern.

Finally, plug in the given input to determine the final answer.

The correct answer is: answer