[Solved] What does the Ruby method flat_map do when applied to an array of arrays? — Ans: It applies a block to each element and flattens the result by one level. | Ruby

Ruby - Enumerable and Collection Processing

What does the Ruby method flat_map do when applied to an array of arrays?

AIt removes duplicate elements from the array.

BIt only flattens the array without applying any block.

CIt applies a block to each element and flattens the result by one level.

DIt maps elements but keeps the nested structure intact.

Step-by-Step Solution

Solution:

Step 1: Understand flat_map behavior
The flat_map method applies a block to each element of the array.
Step 2: Flatten the mapped results
After mapping, it flattens the resulting array by one level, combining nested arrays into a single array.
Final Answer:
It applies a block to each element and flattens the result by one level. -> Option C
Quick Check:
flat_map = map + flatten(1) [OK]

Quick Trick: Remember: flat_map = map + flatten one level [OK]

Common Mistakes:

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What does the Ruby method flat_map do when applied to an array of arrays?