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Map-reduce uses custom __________ functions to perform the map and reduce operations.

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Map-reduce uses custom __________ functions to perform the map and reduce operations.

(a) Java

(b) Javascript

(c) JSON

(d) None of the mentioned

I had been asked this question in examination.

The origin of the question is Map-Reduce in division Aggregation Concepts and Aggregation Mechanics of MongoDB

1 Answer

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Best answer
The correct choice is (b) Javascript

Easiest explanation: JavaScript provide great flexibility compared to the aggregation pipeline.

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