How can you check if the number 10 exists in a flattened version of this array?

hard📝 Application Q9 of 15

Ruby - Arrays

arr = [5, [10, 15], [20, [25]]]

Aarr.flatten.include?(10)

Barr.include?(10)

Carr.length.include?(10)

Darr.flatten.length(10)

Step-by-Step Solution

Solution:

Step 1: Flatten the nested array
Use arr.flatten to get a single-level array.
Step 2: Check if 10 is included
Use include?(10) on the flattened array to check presence.
Final Answer:
arr.flatten.include?(10) -> Option A
Quick Check:
Flatten then include? to check nested elements [OK]

Quick Trick: Flatten first, then use include? to check elements [OK]

Common Mistakes:

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