Given a hash h = {a: 1, b: 2, c: 3}, how can you create a new hash with keys and their values doubled?

hard📝 Application Q8 of 15

Ruby - Hashes

Given a hash h = {a: 1, b: 2, c: 3}, how can you create a new hash with keys and their values doubled?

Ah.each_with_object({}) { |(k,v), new_h| new_h[k] = v * 2 }

Bh.keys.map { |k| k * 2 }

Ch.values.each { |v| v * 2 }

Dh.map { |k, v| [k * 2, v] }.to_h

Step-by-Step Solution

Solution:

Step 1: Understand the goal
Create a new hash with the same keys but values doubled.
Step 2: Analyze each option
B uses each_with_object to build a new hash with doubled values correctly. A returns an array of doubled keys. C does not build a hash. D doubles keys, not values.
Final Answer:
h.each_with_object({}) { |(k,v), new_h| new_h[k] = v * 2 } -> Option A
Quick Check:
Use each_with_object to build new hash with transformed values [OK]

Quick Trick: Use each_with_object to build new hash with changed values [OK]

Common Mistakes:

MISTAKES

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